TABLE 1.
Demographic characteristics of study population.
| Variables | Current smokers (n = 19,643) | Ex-smokers (n = 2,472) | p |
| Men N (%) | 18,643 (94.90) | 2,321 (93.90) | 0.033 |
| Age (year groups) N (%) | <0.001 | ||
| 20–29 | 1,375 (7.00) | 102 (4.13) | |
| 30–39 | 2,711 (13.80) | 250 (10.11) | |
| 40–49 | 4,894 (24.91) | 449 (18.16) | |
| 50–59 | 5,736 (29.20) | 679 (27.47) | |
| 60–69 | 4,927 (25.08) | 992 (40.13) | |
| Median (IQR) | 51.00 (18.00) | 55.00 (17.00) | <0.001 |
| Ethnicity N (%) | 0.004 | ||
| Han | 17,682 (90.02) | 2,271 (91.87) | |
| Others | 1,961 (9.98) | 201 (8.13) | |
| Residence N (%) | 0.002 | ||
| Urban | 8,405 (42.79) | 1,139 (46.08) | |
| Rural | 11,238 (57.21) | 1,333 (53.92) | |
| Marital status N (%) | <0.001 | ||
| Single | 1,449 (7.38) | 109 (4.41) | |
| Married | 16,671 (84.87) | 2,175 (87.99) | |
| Separated/Divorced/Widowed | 1,523 (7.75) | 188 (7.61) | |
| Education N (%) | 0.020 | ||
| Primary school | 6,669 (33.95) | 801 (32.40) | |
| Middle or high school | 10,850 (55.24) | 1,360 (55.02) | |
| College and higher education | 2,124 (10.81) | 311 (12.58) | |
| Geographical region N (%) | <0.001 | ||
| East | 7,197 (36.64) | 1,093 (44.22) | |
| Central | 5,292 (26.94) | 688 (27.83) | |
| West | 7,154 (36.42) | 691 (27.95) | |
| Annual household income (RMB) N (%) | <0.001 | ||
| <20,000 | 6,143 (31.27) | 707 (28.6) | |
| 20,000–49,999 | 6,677 (33.99) | 755 (30.54) | |
| ≥50,000 | 6,823 (34.74) | 1,010 (40.86) | |
| Median (IQR) | 30,000 (46,000) | 30,000 (45,000) | <0.001 |
| Self-reported overall health status N (%) | <0.001 | ||
| Good | 11,310 (57.58) | 1,225 (49.56) | |
| Average | 6,968 (35.47) | 960 (38.83) | |
| Poor | 1,365 (6.95) | 287 (11.61) |
Data are shown as number (%), median (IQR) or mean (SE).