Table 1.

Overall sample characteristics (≥60 years, N = 20,939)^a

	Tromsø 4 (1994-95)	Tromsø 6 (2007-08)			Tromsø 7 (2015-16)		Total
Men	N (%)	Attendance (%)	N (%)	Attendance (%)	N (%)	Attendance (%)	N
Age groups
60-69	1,479	87	1,995	74	2,502	71	5,976
70+	1,134	70	1,037	61	1,663	63	3,834
Total	2,613	78	3,032	69	4,165	68	9,810
Age, mean (SD)	69.1 (6.8)		67.8 (6.4)		68.8 (6.7)
Education (%)
Higher (>12 years)	360 (14)		980 (33)		1644 (41)
Relationship status (%)
Spouse or partner	1819 (82)		2441 (82)		3251 (81)
Women	N (%)	Attendance (%)	N (%)	Attendance (%)	N (%)	Attendance (%)	N
Age groups
60-69	1,620	90	2,107	80	2,677	75	6,404
70+	1,628	67	1,323	58	1,774	55	4,725
Total	3,248	76	3,430	70	4,451	65	11,129
Age, mean (SD)	70.5 (7.1)		68.6 (7.0)		68.9 (7.0)
Education (%)
Higher (>12 years)	210 (7)		711 (21)		1431 (33)
Relationship status (%)
Spouse or partner	1369 (57)		1958 (60)		2654 (65)

^aNumber of participants (N) and attendance rates of the overall invited residents in Tromsø (%), stratified by age and sex in three surveys from the Tromsø Study