Table 2 Sample description of OTK children before (i.e., cohorts 2016–2019) and during or after (i.e., cohorts 2020–2022) the Covid-19 pandemic
Cohorts | N children (% girls) | N test scores | Age [years] M (SD) | N schools |
|---|---|---|---|---|
Pre-pandemic (2016–2019) | 14,210 (41%) | 82,150 | 9.38 (0.25) | 499 |
During and after the pandemic (2020–2022) | 13,173 (42%) | 75,601 | 9.34 (0.27) | 495 |
Total | 27,383 (42%) | 157,751 | 9.36 (0.26) | 514 |