TABLE 1.
Sample size according to the basic characteristics of study population (n = 35,146)
| Male | Female | Total | |
|---|---|---|---|
| Total | 14,978 | 20,168 | 35,146 |
| Age, n (%) | |||
| 18–49 y | 6085 (40.6) | 9421 (46.7) | 15,506 (44.1) |
| ≥50 y | 8893 (59.4) | 10,747 (53.3) | 19,640 (55.9) |
| Living area, n (%) | |||
| Urban | 7565 (50.5) | 10,423 (51.7) | 17,988 (51.2) |
| Rural | 7413 (49.5) | 9745 (48.3) | 17,158 (48.8) |
| Educational level, n (%) | |||
| Illiteracy | 1001 (6.7) | 3304 (16.4) | 4305 (12.2) |
| Elementary | 4067 (27.2) | 6279 (31.1) | 10,346 (29.4) |
| Middle school | 5805 (38.8) | 6433 (31.9) | 12,238 (34.8) |
| High school | 2674 (17.9) | 2815 (14.0) | 5489 (15.6) |
| Community college and above | 1431 (9.6) | 1337 (6.6) | 2768 (7.9) |
| Annual per capita household income, n (%) | |||
| <10,000 yuan | 7338 (49.0) | 9786 (48.5) | 17,124 (48.7) |
| 10,000–14,999 yuan | 2733 (18.2) | 3782 (18.8) | 6515 (18.5) |
| 15,000–24,999 yuan | 2670 (17.8) | 3531 (17.5) | 6201 (17.6) |
| ≥25,000 yuan | 1558 (10.4) | 2084 (10.3) | 3642 (10.4) |
| No answer | 679 (4.5) | 985 (4.9) | 1664 (4.7) |
| Smoking, n (%) | |||
| Yes | 9259 (61.8) | 932 (4.6) | 10,191 (29.0) |
| No | 5719 (38.2) | 19,236 (95.4) | 24,955 (71.0) |