Table 1. Description of independent variables.
| N | Percent (%)) | ||
|---|---|---|---|
| Age (years) | 15–24* | 2,222 | 11.80 |
| 25–34 | 2,954 | 15.68 | |
| 35–44 | 4,576 | 24.30 | |
| 45–54 | 5,167 | 27.43 | |
| 55–64 | 3,915 | 20.79 | |
| Education status | Illiterate* | 2,875 | 15.26 |
| Primary school | 4,526 | 24.03 | |
| Junior high school | 7,388 | 39.23 | |
| Senior high school | 2,708 | 14.38 | |
| Junior college and above | 1,337 | 7.10 | |
| Marital status | Unmarried* | 1,953 | 10.37 |
| married | 16,128 | 85.63 | |
| Widowed and divorced | 753 | 4.00 | |
| Employment status | Employed* | 14,503 | 77.00 |
| retirement | 658 | 3.49 | |
| student | 906 | 4.81 | |
| unemployed | 2,767 | 14.69 | |
| Economic status | Lowest group* | 3,885 | 20.63 |
| Lower group | 3,650 | 19.38 | |
| Medium group | 3,769 | 20.01 | |
| Higher group | 3,764 | 19.99 | |
| Highest group | 3,766 | 20.00 | |
| Urban and rural | Urban* | 6,713 | 35.64 |
| rural | 12,121 | 64.36 | |
| Region | Shannan* | 6,042 | 32.08 |
| Guanzhong | 9,646 | 51.22 | |
| Shanbei | 3,146 | 16.70 | |
| Illness in last two weeks | Not ill in last two weeks* | 15,463 | 82.10 |
| Ill in last two weeks | 3,371 | 17.90 | |
| Chronic disease | No chronic disease* | 15,209 | 80.75 |
| Has chronic disease | 3,625 | 19.25 | |
| Self-rated health | Good* | 14,492 | 76.95 |
| Poor | 4,342 | 23.05 | |
* Reference levels in the probit regression