Table 1.

Sample characteristics at baseline

	I1 (n = 776)		I2 (n = 873)		C (n = 637)
	n	%	n	%	n	%
Sex
Male	300	39.4	313	37.4	246	39.4
Female	462	60.6	524	62.6	378	60.6
Age (in years)
≤ 25	58	7.5	66	7.6	61	9.6
26–35	152	19.6	111	12.7	134	21.1
36–45	122	15.7	100	11.5	75	11.8
46–55	204	26.3	242	27.7	174	27.4
56–65	133	17.1	190	21.8	96	15.1
66–75	62	8.0	85	9.7	61	9.6
≥ 76	45	5.8	79	9.0	33	5.2

Values may not sum up to the total amount due to missing values