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Summary statistics of the estimation sample
| Omicron | Delta | Rest | |
| n | 7046 | 14 369 | 592 033 |
| Person-weeks | 56 368 | 114 952 | 4 736 264 |
| Age, mean (SD) | 6.1 (3.1) | 6.9 (2.8) | 5.1 (3.2) |
| Born in foreign country (%) | 7.2 | 6.3 | 5.5 |
| Parents born in foreign country (%) | 53.7 | 43.0 | 38.8 |
| Boys (%) | 51.3 | 51.4 | 51.3 |
