Table 1.
Characteristics of 10,648 participants stratified by the survey year (n, %), CHNS.
| Variable | 2004 | 2006 | 2009 | 2011 | Total | |
|---|---|---|---|---|---|---|
| Residence | Urban | 837 (34.9%) | 810 (34.1%) | 895 (34.6%) | 1321 (40.2%) | 3863 (36.3%) |
| Rural | 1560 (65.1%) | 1565 (65.9%) | 1693 (65.4%) | 1967 (59.8%) | 6785 (63.7%) | |
| Age | 46.70 ± 13.71 | 47.75 ± 13.54 | 48.33 ± 13.92 | 35.34 ± 8.09 | 48.22 ± 13.74 | |
| Marital status | Spinsterhood | 201 (8.4%) | 157 (6.6%) | 180 (7.0%) | 172 (5.2%) | 710 (6.7%) |
| Married | 2090 (87.2%) | 2110 (88.8%) | 2285 (88.3%) | 2939 (89.4%) | 9424 (88.5%) | |
| Other 1 | 106 (4.4%) | 108 (4.5%) | 123 (4.8%) | 177 (5.4%) | 514 (4.8%) | |
| Highest education levels | PSB 2 | 1709 (71.3%) | 1606 (67.7%) | 1817 (70.2%) | 2081 (63.3%) | 7213 (67.7%) |
| SPSG 3 | 557 (23.2%) | 602 (25.3%) | 591 (22.8%) | 769 (23.4%) | 2519 (23.7%) | |
| UA 4 | 131 (5.5%) | 167 (7.0%) | 180 (7.0%) | 438 (13.3%) | 916 (8.6%) | |
| Working status | Yes | 1769 (73.8%) | 1748 (73.6%) | 1921 (74.2%) | 2422 (73.7%) | 7860 (73.8%) |
| No | 628 (26.2%) | 627 (26.4%) | 667 (25.8%) | 866 (26.3%) | 2788 (26.1%) | |
| Tobacco consumption | Yes | 1750 (73.0%) | 1718 (72.3%) | 1807 (69.8%) | 2342 (71.2%) | 7617 (71.5%) |
| No | 647 (27.0%) | 657 (27.7%) | 781 (30.2%) | 946 (28.8%) | 3031 (28.5%) | |
1 Divorce, widowed, separated and unknown; 2 Unfinished primary school and below; 3 Secondary and primary school graduates; 4 University or above.