Table 1

Basic questionnaire participation rates among all invitees by age group and biobank

Age	Helsinki (n=2000)			Tampere (n=1995)			Auria (n=2000)			All (n=5995)
Age	Invited	Participated	Participation rate (%)	Invited	Participated	Participation rate (%)	Invited	Participated	Participation rate (%)	Invited	Participated	Participation rate (%)
20–29	149	22	14.8	116	18	15.5	41	8	19.5	306	48	15.7
30–39	426	70	16.4	273	51	18.7	115	23	20.0	814	144	17.7
40–49	379	93	24.5	231	44	19.0	159	49	30.8	769	186	24.2
50–59	484	133	27.5	303	58	19.1	218	64	29.4	1005	255	25.4
60–69	562	142	25.3	410	93	22.7	533	150	28.1	1505	385	25.6
70–79	0	0	0.0	503	62	12.3	686	21	3.1	1189	83	7.0
80–89	0	0	0.0	152	13	8.6	226	1	0.4	378	14	3.7
90–99	0	0	0.0	7	0	0.0	22	0	0.0	29	0	0.0
Total	2000	460	23	1995	339	17	2000	316	15.8	5995	1115	18.6