Table 1.

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)