Table 1 Characteristics of the study population by survey year
| Â | 2003 | 2009 | 2010 | 2012 |
|---|---|---|---|---|
(n = 6890) | (n = 16,418) | (n = 17,145) | (n = 13,744) | |
Sex, % (n) | ||||
 Men | 50.3 (3224) | 50.2 (6930) | 50.2 (7330) | 50.3 (6799) |
 Women | 49.7 (3666) | 49.8 (9488) | 49.8 (9815) | 49.7 (6945) |
Age, years | ||||
 Mean ± SD | 46.2 ± 12.4 | 46.8 ± 12.4 | 46.8 ± 12.3 | 46.9 ± 12.1 |
Age group, % (n) | ||||
 25–39 years | 35.4 (2237) | 31.3 (4761) | 30.7 (5015) | 30.0 (3162) |
 40–49 years | 24.9 (2073) | 27.6 (4924) | 27.9 (4992) | 27.5 (3665) |
 50–59 years | 19.4 (1363) | 22.0 (3704) | 22.6 (3931) | 24.4 (3592) |
 60–69 years | 20.3 (1217) | 19.1 (3029) | 18.8 (3207) | 18.2 (3325) |
Education, % (n) | ||||
 Low | 37.5 (2003) | 33.5 (3580) | 33.1 (3656) | 28.6 (2399) |
 Medium | 47.0 (3249) | 50.1 (8110) | 49.1 (8212) | 51.3 (6847) |
 High | 15.6 (1605) | 16.4 (4698) | 17.8 (5254) | 20.1 (4476) |