Table 1. Age and sex distribution according to the study period.
| Factor | Subgroup | 1995 (n=5,356) | 1999 (n=6,314) | 2004 (n=11,293) | 2009 (n=14,658) | 2014 (n=15,613) | 2019 (n=14,076) |
|---|---|---|---|---|---|---|---|
| Age (yr) | 59.2±11.9 | 60.9±12.1 | 62.9±11.9 | ||||
| Age distribution (yr) | ≤30 | 103 (1.9) | 115 (1.8) | 142 (1.3) | 134 (0.9) | 88 (0.6) | 59 (0.4) |
| 31–40 | 612 (11.4) | 622 (9.9) | 855 (7.6) | 972 (6.6) | 810 (5.2) | 491 (3.5) | |
| 41–50 | 910 (17.0) | 1,033 (16.4) | 2,106 (18.7) | 2,492 (17.0) | 2,313 (14.8) | 1,625 (11.5) | |
| 51–60 | 1,727 (32.2) | 1,848 (29.3) | 2,732 (24.2) | 3,762 (25.7) | 4,257 (27.3) | 3,688 (26.2) | |
| 61–70 | 1,516 (28.3) | 1,971 (31.2) | 3,866 (34.2) | 4,527 (30.9) | 4,195 (26.9) | 4,162 (29.6) | |
| ≥71 | 488 (9.1) | 725 (11.5) | 1,589 (14.1) | 2,768 (18.9) | 3,949 (25.3) | 4,051 (28.8) | |
| Sex | Male | 3,569 (66.5) | 3,949 (62.5) | 7,586 (67.2) | 9,816 (67.0) | 10,298 (66.0) | 9,228 (65.6) |
| Female | 1,799 (33.5) | 2,368 (37.5) | 3,705 (32.8) | 4,839 (33.0) | 5,315 (34.0) | 4,848 (34.4) | |
| Ratio | 1.98:1 | 1.67:1 | 2.05:1 | 2.03:1 | 1.94:1 | 1.90:1 | |
| BMI (kg/m2) | NA | NA | NA | NA | 23.4±3.3 | 23.9±3.4 | |
| BMI distribution (kg/m2) | <18.5 | 900 (5.9) | 667 (4.8) | ||||
| 18.5–24.9 | 10,228 (65.4) | 8,343 (59.9) | |||||
| 25.0–29.9 | 3,950 (25.7) | 4,320 (31.0) | |||||
| ≥30 | 462 (3.0) | 600 (4.3) |
Values are presented as mean±standard deviation or number (%). The sum of the percentages does not equal 100% because of rounding.
BMI = body mass index; NA = not available (items were not included in the survey).