LOCKDOWN LEARNING: CHANGES IN ONLINE STUDY ACTIVITY AND PERFORMANCE OF DUTCH SECONDARY SCHOOL STUDENTS DURING THE COVID-19 PANDEMIC - PSYARXIV ...

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Lockdown Learning:
Changes in Online Study Activity and Performance of Dutch
Secondary School Students during the COVID-19 Pandemic

            Maarten van der Velde                          Florian Sense                        Rinske Spijkers
             University of Groningen                  University of Groningen                Noordhoff Publishers
           Groningen, The Netherlands               Groningen, The Netherlands            Groningen, The Netherlands
            m.a.van.der.velde@rug.nl
                                      Martijn Meeter                      Hedderik van Rijn
                               Vrije Universiteit Amsterdam             University of Groningen
                               Amsterdam, The Netherlands             Groningen, The Netherlands

ABSTRACT                                                              children [29]. Indeed, initial reports have suggested learning
The COVID-19 pandemic caused lockdowns and sudden school              decrements [10, 17] and adverse mental health effects [5, 26,
closures around the world in spring 2020, significantly impact-       34] in primary school students, compared to preceding years.
ing the education of students. Here, we investigate how the           In many cases, the shift to distance learning also reinforced ex-
switch to distance learning affected study activity and perfor-       isting inequalities: students from disadvantaged backgrounds
mance in an online retrieval practice tool used for language          were found to suffer greater learning setbacks than their more
learning in Dutch secondary education. We report insights             advantaged peers [1, 2, 8, 9, 10], and there were reports of dis-
from a rich data set consisting of over 116 million retrieval prac-   parities in access to resources and preparedness of instruction
tice trials completed by more than 133 thousand students over         materials required for distance learning between educational
the course of two consecutive school years. Our findings show         levels and schools [6, 24, 30].
that usage of the tool increased substantially at the start of
lockdown, with the bulk of study activity occurring on weekday        While many studies have reported on pandemic-related learn-
mornings. In general, students’ progress through the material         ing losses in primary education, relatively little is known about
was largely unaffected by lockdown, although students from            the impact of the pandemic on older students. Surveys of sec-
the highest educational track were somewhat more likely to            ondary school students have suggested that these students
be on or ahead of schedule than students from lower tracks,           spent significantly less time on school work during lockdown [3,
compared to the previous year. Performance on individual              13], and had difficulty concentrating at home [7]. In higher
study trials was generally stable, but accuracy and response          education, preliminary results point to a similar drop in mo-
time on open answer questions went up, perhaps as a result            tivation and effort, but indicate that academic performance
of students being more focused at home. These encouraging             was unaffected or even somewhat improved [12, 15, 23]. These
findings contribute to a growing literature on the educational        findings suggest that learning losses may vary with student
ramifications of distance learning during lockdown.                   age—perhaps as a function of students’ developing ability to
                                                                      engage in self-regulated learning [25].
Keywords
Distance learning, learning analytics, COVID-19, technology-          One factor that likely contributed to variation in the extent to
enhanced learning                                                     which students were affected by school closures is the availabil-
                                                                      ity of digital educational materials and online learning tools [11,
                                                                      14, 16]. German secondary school students reported spending
1.   INTRODUCTION                                                     more time on school work if their school offered more digital
The COVID-19 pandemic has led to school closures around               learning materials [3]. A study of French university students
the world. As schools shifted to distance learning in early           showed that, in a course redesigned around appropriate online
2020, teachers were forced to swiftly revise their teaching meth-     tools, distance learning achieved similar learning outcomes
ods [14, 20, 24]. The rapid transition has caused widespread          to a course taught in person [15]. Offering online adaptive
concern about compromised learning and mental health in               practice software as part of the curriculum could even benefit
                                                                      students, as a study of Dutch primary schools showed that
                                                                      including such software in mathematics education led to stu-
                                                                      dents performing better, not worse, than they would otherwise
                                                                      have [22]. Dutch educators surveyed before and during the
                                                                      lockdown reported seeing the benefits of digital learning tools,
                                                                      remarking on their efficiency and ability to offer a personalised
                                                                      learning experience in particular [31]. The development of
                                                                      suitable digital materials and learning tools may thus mitigate
                                                                      (some of) the impact of school closures on learning.
Number of students          Number of trials           Split multiple choice / open answer
                 Course     18/19         19/20         18/19           19/20               18/19                19/20
                 English   58,422        61,962    38,334,387       43,072,404    99.98% / 00.02%     99.99% / 00.01%
                 French    21,551        26,292    14,582,897       20,276,843    56.39% / 43.61%     58.68% / 41.32%
                 Total     75,695        83,496    52,917,284       63,349,247

Table 1: Available data per course and school year. Some students used the tool for both English and French and/or in more than
one school year, causing the total number of students to be slightly less than the sum of the separate counts.

To explore this further, we studied the use of online learning          translation pourquoi. Data recorded in each trial included the
tools in secondary education in the Netherlands during the              response accuracy and response time, as well as information
spring 2020 school closures. The Netherlands was relatively             about the question format, the studied item, and the corre-
well-prepared for distance learning in terms of technological           sponding textbook chapter. Over the course of two school years
infrastructure [10]; the regular curriculum already included            and across both courses, a total of 133,450 students completed
digital components, and, by-and-large, students had access              116,266,531 trials. Table 1 summarises the data in the sample.
to the necessary tools at home [7]. The online learning tool
that we studied enables self-regulated, autonomous rehearsal            Approval to analyse the anonymised activity data was granted
of foreign-language vocabulary. This tool was accessible to a           by the Ethics Committee Psychology of the University of
large number of students in different year groups (12-16 years          Groningen (study code: PSY-1920-S-0397).
old) and educational tracks (pre-vocational, general secondary,
and pre-university), and was already widely used before the             3.    RESULTS
lockdown. This enabled us to compare usage and performance
                                                                        We addressed the two research questions outlined in the In-
during the school closure period to measurements from earlier
                                                                        troduction by first looking at usage of the retrieval practice
in the same school year and from the same period in the year
                                                                        tool over time, and then investigating how study performance
before. As such, the data collected from this tool provides valu-
                                                                        changed during lockdown.
able insight into the effects of lockdown on Dutch secondary
students’ learning.
                                                                        All analyses were conducted in R (version 3.6.3; [27]). Regres-
                                                                        sion models were fitted using the lme4 (version 1.1-21; [4]) and
In this paper, we use the collected data to address two research
                                                                        lmerTest (version 3.1-0; [18]) packages. The analysis code is
questions:
                                                                        available at https://osf.io/t25fe/.

     1. Did usage of the retrieval practice tool change during          3.1      Study activity
        the lockdown period?                                            To identify changes in usage of the retrieval practice tool, we
                                                                        looked at the frequency of study trials over time, as well as
     2. Did retrieval practice performance change during the            the time of day at which students were most active.
        lockdown period?

                                                                         3.1.1    Study frequency
2.     DATA SET                                                         Figure 1 shows French-language study activity during both
We recorded the online retrieval practice activity of a large           school years in terms of the total number of practice trials com-
sample of secondary education students in the Netherlands               pleted per week, stratified by year group and educational track.
during two consecutive school years (18/19 and 19/20; both              It also shows the percentage change in trial count during the
school years lasting from 1 August to 31 July). The sample              whole lockdown period, marked in grey, relative to the same
includes students from each of the three educational tracks in          period in the previous school year. Across all strata, there
Dutch secondary education—pre-vocational (vmbo), general                was a notable increase in study activity during the lockdown
secondary (havo) and pre-university (vwo)—and from year                 period; in the most extreme cases, the number of completed
groups 1 (age: 12; corresponds to grade 7) through 4 (age: 16;          trials grew almost nine-fold. Usage increased more strongly in
corresponds to grade 10).                                               higher year groups, where baseline usage was much lower. The
                                                                        increased usage persisted after schools started to reopen in
Students in the sample used SlimStampen, an online, adaptive            June 2020. Similar patterns were found in English-language
retrieval practice tool made available to them through Noord-           study activity (see Figure S1)1 .
hoff Publishers as part of the foreign language learning cur-
riculum for English and French. The workings of this tool are
described in detail in [28, 32, 33]. The tool enabled students to        3.1.2    Study timing
rehearse the course material through retrieval practice sessions,       The effects of distance learning during lockdown were also
both upon their teacher’s instruction and of their own volition.        visible in the time of day at which students were actively using
Sessions consisted of a sequence of trials in which students re-        the retrieval practice tool. Figure 2A shows how study activity
hearsed a set of foreign vocabulary items by answering retrieval        1
                                                                          Wherever analyses are split by year group and educational
prompts in various formats. For example, a student practis-             track, we only show the French results in the main article.
ing French vocabulary might see the Dutch prompt waarom                 Results for English-language study are included in the
(English: why) and be asked to retrieve and type its French             supplement.
Year 1                                            Year 2                                        Year 3/4
                                                          Change:                                         Change:                                        Change:
                   300,000                                 188%                                            452%                                           846%

                                                                                                                                                                        Pre−vocational
                                                                                                                                                                           (vmbo)
                   200,000

                   100,000

                         0
                                                          Change:                                         Change:                                        Change:

                                                                                                                                                                        General secondary
 Trials per week

                   300,000                                 224%                                            588%                                           870%
                                                                                                                                                                                            School year

                                                                                                                                                                             (havo)
                   200,000                                                                                                                                                                      18/19
                                                                                                                                                                                                19/20
                   100,000

                         0
                                                          Change:                                         Change:                                        Change:
                   300,000                                 222%                                            404%                                           778%

                                                                                                                                                                        Pre−university
                                                                                                                                                                            (vwo)
                   200,000

                   100,000

                         0
                             Oct     Dec      Feb         Apr     Jun        Oct        Dec     Feb       Apr       Jun       Oct     Dec      Feb      Apr    Jun

Figure 1: Comparison of French-language study activity during a regular school year (18/19) and the school year affected by
COVID-19 (19/20), stratified by year group (columns) and education track (rows). Activity is measured through the number
of trials completed per week. The shaded area marks the school closure period in the 19/20 school year. The change in activity
during this period is shown as a percentage in each plot.

 A                                                            English                                                               French
                      Monday
                     Tuesday
                   Wednesday                                                                                                                                                                     0.03
                                                                                                                                                                        18/19
                    Thursday
                       Friday
                     Saturday                                                                                                                                                                    0.02
                      Sunday
                      Monday                                                                                                                                                                     0.01
                     Tuesday
                   Wednesday
                                                                                                                                                                        19/20

                    Thursday                                                                                                                                                                     0.00
                       Friday
                     Saturday
                      Sunday
                                 0       3       6        9      12     15         18     21          0         3     6        9      12       15       18    21
                                                                                    Time of day (hour)
 B                                                        English                                                                    French
                                                                                                                                                                                                 0.01
    Monday
   Tuesday
                                                                                                                                                                                  Change

 Wednesday                                                                                                                                                                                       0.00
  Thursday
     Friday
   Saturday                                                                                                                                                                                      −0.01
    Sunday
                             0       3       6        9         12      15     18         21          0         3         6     9      12       15       18        21
                                                                                    Time of day (hour)

Figure 2: A: Distribution of study trials over the week during the school closure period (16 March–2 June) in both school years. The
colour of each square shows how many trials were recorded in a learning session starting within a particular hour on a particular week-
day, as a proportion of the entire week. B: Change in distribution of study trials from the 18/19 school year to the 19/20 school year.
was distributed over the week during the school closure period,     no open answer questions (see Table 1), so only multiple choice
as well as during the same period in the preceding school           performance is reported for English. We saw similar changes
year. The year-on-year change is depicted in Figure 2B, which       in trial-level performance across educational tracks and year
shows that study activity during lockdown shifted towards           groups; here we report performance at the population level.
the weekday mornings, with less activity being recorded on
weekday afternoons and on Sundays.                                  Figure 4A shows mean response accuracy over the course of
                                                                    the school year. Accuracy on multiple choice questions was
                                                                    consistently high in both courses, a pattern that continued
3.2      Study performance                                          during the lockdown period in the 19/20 school year. Accuracy
We assessed the effects of distance learning on study perfor-
                                                                    on open answer questions, however, did change over the course
mance in two ways. Firstly, we tracked students’ progression
                                                                    of the 19/20 school year, increasing by about six percentage
through the study materials in aggregate to identify changes in
                                                                    points from the period before the lockdown (M = 77.47%,
study pace. Secondly, to identify more immediate behavioural
                                                                    SD = 17.77%) to the lockdown period itself (M = 83.64%,
effects, we looked at response accuracy and response time at
                                                                    SD = 15.25%) and remaining higher after schools had started
the level of individual trials.
                                                                    reopening (M = 81.98%, SD = 17.94%). These patterns were
                                                                    confirmed by a binomial generalised linear mixed-effects model
 3.2.1    Progress through materials                                fitted to students’ daily accuracy scores (see Table S1). Due to
Figure 3 visualises students’ progress through the textbook         the size of the data set, the model found significant changes in
chapters of the French course over the school year. Figure S2       accuracy over time for both question types, but there was only
shows the same for English. The time plots show the weekly          a large effect size for open answer questions in the lockdown
share of trials that correspond to each chapter per year group      and post-lockdown periods of the 19/20 school year.
and track in both school years. Gaps indicate weeks in which
no trials were recorded. There was generally a smooth pro-          There were similar trends in the response time measured on
gression over time from one chapter to the next; a trend that       correct answers, as Figure 4B shows. While response times on
appeared to continue during the lockdown. To measure the            multiple choice questions remained stable across both school
effect of distance learning on progress, we performed pairwise      years, response times on French open answer questions did
comparisons of the chapter distribution (i.e., the proportion       change, increasing by about 0.25 s from the pre-lockdown
of trials associated with each chapter) during the lockdown         period (M = 2.42 s, SD = 4.49 s) to the lockdown (M = 2.67
period in the 19/20 school year and the same period in the          s, SD = 2.65 s) and the period that followed (M = 2.68 s,
preceding school year using a chi-square test of homogeneity.       SD = 2.50 s). These changes were confirmed by a generalised
This test was done separately for each combination of year          linear mixed-effects model (see Table S2). Although we can-
group and education level. In all cases, we found that there        not be certain about the cause, the higher response time and
was a significant year-on-year change (all p < .001). However,      accuracy may indicate that students experienced less time
the observed changes in trial share were largely within the         pressure or were more focused on the task at home than at
bounds of typical fluctuations between school years, as a com-      school, typing out their responses more carefully.
parison to changes outside the lockdown period indicated. We
calculated the year-on-year change in trial share per chapter
over the period preceding the lockdown, using a sliding window
                                                                    4.   DISCUSSION
                                                                    Our results show that the shift to distance learning during the
of equal duration to the lockdown period. The change plots
                                                                    COVID-19 lockdown of spring 2020 coincided with an increase
in Figure 3 show the spread of these typical changes as two
                                                                    in usage of an online retrieval practice tool by students in
grey bands, extending to 1 SD and 2 SD, respectively. The
                                                                    Dutch secondary education, with activity increasing on week-
changes in trial share during the lockdown period, shown as
                                                                    day mornings in particular. In general, we found little evidence
points, fall mostly within this range. Larger changes outside
                                                                    of major study delays as a result of the lockdown; students
the typical range sometimes pointed to students being behind
                                                                    in the highest educational track were likely to be on or even
the previous year’s schedule (i.e., one chapter’s trial share was
                                                                    somewhat ahead of the previous year’s schedule, and students
higher than the year before while that of a subsequent chapter
                                                                    in lower tracks were also roughly on schedule. Students’ trial-
was lower), and sometimes to students being ahead of schedule.
                                                                    to-trial learning performance was, if anything, better during
The tendency to be behind or ahead appeared to differ some-
                                                                    the lockdown period than the year before. In particular, we
what between educational tracks: for both French and English,
                                                                    saw higher accuracy and higher response times on open answer
pre-university (vwo) students were ahead of schedule in five
                                                                    questions, perhaps indicating that students experienced less
year groups and on schedule in one group; general secondary
                                                                    time pressure or were better able to focus at home.
(havo) students were ahead in two year groups, on schedule in
three, and behind in one; pre-vocational (vmbo) students were
                                                                    The online learning data reported here offer a detailed look at
ahead of schedule in two year groups, on schedule in three,
                                                                    day-to-day changes in behaviour of a large and diverse group
and behind schedule in two groups.
                                                                    of students. Of course, observing students’ activity in a single
                                                                    online learning tool provides only a limited view into their
 3.2.2    Trial-level performance                                   learning, and students who do not use the tool (anymore) fly
Trial-level performance was measured through response ac-           completely under the radar. A more complete analysis of the
curacy and response time. These variables were analysed             effects of lockdown should also consider other components of
separately for multiple choice questions, which only required       the curriculum and students’ environment. As previous work
the student to select the answer from a set of options, and         has shown, there are likely to be differences among school
open answer questions, which required the student to type the       subjects, students, and schools in how much learning fell be-
answer. The English-language study data contained virtually         hind during lockdown [10, 19, 21, 23]. Identifying the causes
Year 1
                                   Pre−vocational (vmbo)                General secondary (havo)               Pre−university (vwo)
                       100%
    Share of trials

                                                                                                                                            18/19
                                                                                                                                                    Chapter
                        50%
                         0%                                                                                                                            1      5
                       100%                                                                                                                            2      6

                                                                                                                                            19/20
                        50%                                                                                                                            3      7
                         0%
                               Oct       Dec         Feb   Apr   Jun   Oct   Dec       Feb   Apr   Jun   Oct    Dec       Feb   Apr   Jun
    Change

                       20 pp
                        0 pp
                      −20 pp
                               1         2       3     5     6    7    1     2     3     5     6    7    1      2     3     5     6    7

Year 2
                                   Pre−vocational (vmbo)                General secondary (havo)               Pre−university (vwo)
                       100%
    Share of trials

                                                                                                                                            18/19
                                                                                                                                                    Chapter
                        50%
                         0%                                                                                                                            1      5
                       100%                                                                                                                            2      6

                                                                                                                                            19/20
                        50%                                                                                                                            3      7
                         0%
                               Oct       Dec         Feb   Apr   Jun   Oct   Dec       Feb   Apr   Jun   Oct    Dec       Feb   Apr   Jun
    Change

                       20 pp
                        0 pp
                      −20 pp
                               1         2       3     5     6    7    1     2     3     5     6    7    1      2     3     5     6    7

 Year 3/4
                                   Pre−vocational (vmbo)                General secondary (havo)               Pre−university (vwo)                 Chapter
                       100%
    Share of trials

                                                                                                                                            18/19

                        50%                                                                                                                            1      7

                         0%                                                                                                                            2      9
                       100%                                                                                                                            3      12
                                                                                                                                            19/20

                        50%                                                                                                                            5      13
                         0%
                                                                                                                                                       6
                               Oct       Dec         Feb   Apr   Jun   Oct   Dec       Feb   Apr   Jun   Oct    Dec       Feb   Apr   Jun
    Change

                       20 pp
                        0 pp
                      −20 pp
                               1     2       3   5     6   7 12 13     1     2     3     5     6    7    1      2     3     5     6    7

Figure 3: Progress through the French materials over time: the share of study trials pertaining to each textbook chapter as a
percentage of all trials completed in a week. The school closure period in the 19/20 school year and the corresponding period in
the previous year are marked by a dashed border. The change in trial share during this period is shown, per chapter, below each
set of plots, where the dark-grey and light-grey bands indicate the variability between the two school years in the period preceding
the lockdown (1 SD and 2 SD, respectively).
A                                   English                                          French
                 100%
 Accuracy

                  90%
                                                                                                                      School year
                  80%
                                                                                                                           18/19
                  70%                                                                                                      19/20
                         Oct   Dec     Feb     Apr   Jun            Oct        Dec      Feb      Apr       Jun

 B                                   English                                          French                          Question type
 Response time

                 3.5 s                                                                                                     Multiple
                                                                                                                           choice
                 3.0 s                                                                                                     Open
                                                                                                                           answer
                 2.5 s
                 2.0 s

                         Oct   Dec    Feb      Apr   Jun          Oct          Dec     Feb       Apr       Jun

Figure 4: Comparison of study performance over time during a regular school year (18/19) and the school year affected by
COVID-19 (19/20). A: Mean response accuracy (±1 SE). B: Mean response time (±1 SE) on correct answers.

of such differences can be helpful in combating the negative              signers, particularly when regular classroom teaching becomes
consequences of lockdown effectively. Analyses like the current           impossible.
one contribute to this goal.

Reported decrements in learning during the school closures                5.    ACKNOWLEDGEMENTS
could be caused by both lower quantity of learning, and lower             The online retrieval practice tool discussed in this manuscript
quality. Surveys have already shown that secondary school                 is licensed to Noordhoff Publishers by the University of Gronin-
students, on average, spent much less time on school-related              gen.
work during the lockdown than they would normally do [3, 13].
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SUPPLEMENT
Year 1                   Year 2                   Year 3                      Year 4
                   1,000,000
                                              Change:                  Change:                  Change:                     Change:
                                               142%                     164%                     158%                        138%

                                                                                                                                        Pre−vocational
                    750,000

                                                                                                                                           (vmbo)
                    500,000

                    250,000

                           0
                   1,000,000
                                              Change:                  Change:                  Change:

                                                                                                                                        General secondary
 Trials per week

                                               158%                     138%                     198%
                    750,000
                                                                                                                                                              School year

                                                                                                                                             (havo)
                    500,000                                                                                                                                         18/19
                                                                                                                                                                    19/20
                    250,000

                           0
                   1,000,000
                                              Change:                  Change:                  Change:
                                               146%                     208%                     350%

                                                                                                                                        Pre−university
                    750,000

                                                                                                                                            (vwo)
                    500,000

                    250,000

                          0
                               Oct Dec Feb Apr Jun      Oct Dec Feb Apr Jun      Oct Dec Feb Apr Jun      Oct Dec Feb Apr Jun

Figure S1: Comparison of English-language study activity during a regular school year (18/19) and the school year affected by
COVID-19 (19/20), stratified by year group (columns) and education level (rows). Activity is measured through the number of
trials completed per week. The shaded area marks the school closure period in the 19/20 school year. The change in activity
during this period is shown as a percentage in each plot.

  Effect                                                                                                       b       SE                      z                p
  Intercept (Period: pre-lockdown, School year: 19/20, Question type: open answer)                         1.631    0.166          9.83
Year 1
                                     Pre−vocational (vmbo)                                 General secondary (havo)                              Pre−university (vwo)
                                                                                                                                                                                           Chapter
    Share of trials
                       100%

                                                                                                                                                                                   18/19
                        50%                                                                                                                                                                   1      5
                         0%                                                                                                                                                                   2      6
                       100%

                                                                                                                                                                                   19/20
                        50%                                                                                                                                                                   3      7
                         0%                                                                                                                                                                   4      8
                               Oct       Dec             Feb         Apr         Jun   Oct       Dec       Feb             Apr       Jun   Oct       Dec   Feb     Apr       Jun
    Change

                       10 pp
                        0 pp
                      −10 pp
                               1     2       3       4       5       6       7    8    1     2    3        4       5       6     7    8    1     2    3    4   5   6     7    8

Year 2
                                     Pre−vocational (vmbo)                                 General secondary (havo)                              Pre−university (vwo)                      Chapter
    Share of trials

                       100%

                                                                                                                                                                                   18/19
                                                                                                                                                                                              1      6
                        50%
                         0%                                                                                                                                                                   2      7
                       100%                                                                                                                                                                   3      8

                                                                                                                                                                                   19/20
                        50%
                                                                                                                                                                                              4      O
                         0%
                               Oct       Dec             Feb         Apr         Jun   Oct       Dec       Feb             Apr       Jun   Oct       Dec   Feb     Apr       Jun              5
    Change

                       10 pp
                        0 pp
                      −10 pp
                               1     2       3   4       5       6    7        8 O     1     2   3     4       5       6    7    8 O       1     2    3    4   5   6     7    8

Year 3
                                     Pre−vocational (vmbo)                                 General secondary (havo)                              Pre−university (vwo)                      Chapter
    Share of trials

                       100%

                                                                                                                                                                                   18/19
                                                                                                                                                                                              1      6
                        50%
                         0%                                                                                                                                                                   2      7
                       100%                                                                                                                                                                   3      8

                                                                                                                                                                                   19/20
                        50%
                                                                                                                                                                                              4      O
                         0%
                               Oct       Dec             Feb         Apr         Jun   Oct       Dec       Feb             Apr       Jun   Oct       Dec   Feb     Apr       Jun              5
    Change

                       10 pp
                        0 pp
                      −10 pp
                               1         2       3       4       5         6      O    1     2   3     4       5       6    7    8 O       1     2    3    4   5   6     7    8

Year 4
                                     Pre−vocational (vmbo)                                 General secondary (havo)                              Pre−university (vwo)
    Share of trials

                       100%                                                                                                                                                                Chapter
                                                                                                                                                                                   18/19

                        50%
                         0%                                                                                                                                                                   1      4
                       100%                                                                                                                                                                   2      5
                                                                                                                                                                                   19/20

                        50%
                                                                                                                                                                                              3      O
                         0%
                               Oct       Dec             Feb         Apr         Jun   Oct       Dec       Feb             Apr       Jun   Oct       Dec   Feb     Apr       Jun
    Change

                       10 pp
                        0 pp
                      −10 pp
                               1         2           3       4           5       O

Figure S2: Progress through the English materials over time: the share of study trials pertaining to each textbook chapter as a
percentage of all trials completed in a week. The school closure period in the 19/20 school year and the corresponding period in the
previous year are marked by a dashed border. The change in trial share during this period is shown below each set of plots, where
the dark-grey and light-grey bands indicate the variability between the two school years in the period preceding the lockdown (1
SD and 2 SD, respectively).
Effect                                                                                       b      SE          z        p
 Intercept (Period: pre-lockdown, School year: 19/20, Question type: open answer)     2133.210    13.019   163.85
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