Table 1.
Characteristics of the study participants.
| Characteristics | Male | Female | Overall |
|---|---|---|---|
| Participants, n (%) | 300192 (50.3) | 296344 (49.7) | 596536 (100.00) |
| Age Mean ± SD | 39.0 ± 20.6 | 40.2 ± 20.6 | 39.6 ± 20.6 |
| Age group, n (%) | |||
| <35 | 128973 (43.0) | 122844 (41.5) | 251817 (42.2) |
| 35–45 | 50759 (16.9) | 48823 (16.5) | 99582 (16.7) |
| 45–55 | 46879 (15.6) | 46884 (15.8) | 93763 (15.7) |
| 55–65 | 39366 (13.1) | 40789 (13.8) | 80155 (13.4) |
| 65–75 | 21902 (7.3) | 22938 (7.7) | 44840 (7.5) |
| >75 | 12313 (4.1) | 14066 (4.7) | 26379 (4.4) |
| Education, n (%) | |||
| Primary school or lower | 115885 (38.6) | 133031 (44.8) | 248196 (41.7) |
| Middle school | 156477 (52.1) | 137732 (46.5) | 294209 (49.3) |
| College and higher | 26886 (9.0) | 24844 (8.4) | 51730 (8.7) |
| Missing | 944 (0.3) | 737 (0.2) | 1681 (0.3) |
| Marital status, n (%) | |||
| unmarried | 65912 (22.0) | 50905 (17.2) | 116817 (19.6) |
| Married | 193626 (64.5) | 197534 (66.7) | 391160 (65.6) |
| Divorced and Widowed | 11235 (3.7) | 21499 (7.3) | 32734 (5.5) |
| Not applicable | 27827 (9.3) | 25006 (8.4) | 52833 (8.9) |
| Missing | 1592 (0.5) | 1400 (0.5) | 2992 (0.5) |
SD, standard deviation;