Demographics of the study population before, during and after the first COVID-19 wave
| Total | Before | During | After | |||||
| Subsequent invitation round | ||||||||
| n | % | n | % | n | % | n | % | |
| Total | 2 293 096 | 100.0 | 1 289 655 | 56.2 | 239 538 | 10.4 | 763 903 | 33.3 |
| Men | 1 078 429 | 47.0 | 608 365 | 47.2 | 111 866 | 46.7 | 358 198 | 46.9 |
| Women | 1 214 667 | 53.0 | 681 290 | 52.8 | 127 672 | 53.3 | 405 705 | 53.1 |
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | |||||
| Age in years | 65.2 (5.3) | 66.6 (5.1) | 64.6 (6.1) | 63.0 (4.7) | ||||
| Invitation interval in days | 761.5 (46.2) | 734.8 (9.9) | 759.3 (39.0) | 807.2 (49.8) | ||||
| Screening interval in days | 762.0 (58.9) | 734.3 (36.4) | 772.5 (62.5) | 805.6 (61.2) | ||||