Sociodemographic characteristics and smoking status in the study cohort
| Characteristics | Males | Females | |||||
|---|---|---|---|---|---|---|---|
| n | (%) | n | (%) | ||||
| Age (years) | |||||||
| 41–50 | 3 618 | (32.6) | 1402 | (42.5) | |||
| 51–60 | 3 946 | (35.5) | 1033 | (31.3) | |||
| 61–70 | 2 536 | (22.9) | 638 | (19.3) | |||
| ⩾71 | 1 002 | (9.0) | 228 | (6.9) | |||
| Educational level | |||||||
| No formal education | 1 808 | (16.3) | 1857 | (56.3) | |||
| Elementary school | 6 556 | (59.1) | 1196 | (36.2) | |||
| High school | 2 016 | (18.2) | 184 | (5.6) | |||
| College or above | 498 | (4.5) | 24 | (0.7) | |||
| Unknown | 218 | (2.0) | 40 | (1.2) | |||
| Residence | |||||||
| Metropolitan | 1 029 | (9.3) | 965 | (29.2) | |||
| Urban | 3 281 | (29.6) | 597 | (18.1) | |||
| Rural | 6 198 | (55.9) | 1160 | (35.1) | |||
| Unknown | 588 | (5.3) | 579 | (17.5) | |||
| Smoking status | |||||||
| Never-smoker | 4 613 | (41.6) | 3160 | (95.7) | |||
| Former smoker | 1 258 | (11.3) | 11 | (0.3) | |||
| Current smoker | 5 225 | (47.1) | 130 | (3.9) | |||
| Total | 11 096 | (100.0) | 3301 | (100.0) | |||