Characteristics of the study sample (%)
| Number of participants(%) | Smoking status and intensity (cigarettes per day) | ||||
|---|---|---|---|---|---|
| Non-smokers(n = 37961) | Light smokers (1–9 cigarettes)(n = 3395) | Medium smokers (10–19 cigarettes)(n = 3615) | Heavy smokers(⩾20 cigarettes)(n = 1120) | ||
| p<0.001 in cases (χ2 test). | |||||
| All | 46190 | 82.4 | 7.4 | 7.8 | 2.4 |
| Sex | |||||
| Women | 37309 (81) | 83.7 | 7.7 | 7.2 | 1.4 |
| Men | 8881 (19) | 76.8 | 5.9 | 10.3 | 6.9 |
| Age group (y) | |||||
| 17–29 | 3542 (8) | 79.1 | 10.9 | 8.8 | 1.2 |
| 30–39 | 10179 (22) | 80.8 | 8.7 | 8.5 | 2.0 |
| 40–49 | 15891(34) | 80.3 | 8.1 | 8.8 | 2.8 |
| 50–59 | 15312 (33) | 85.6 | 5.3 | 6.5 | 2.6 |
| 60–65 | 1240 (3) | 90.8 | 3.7 | 3.7 | 1.8 |
| Basic education | |||||
| Common school | 10034 (22) | 79.1 | 6.6 | 10.3 | 4.0 |
| Comprehensive/middle school | 13153 (29) | 76.1 | 9.3 | 11.4 | 3.2 |
| High school | 22181 (49) | 87.5 | 6.5 | 4.6 | 1.3 |
| Marital status | |||||
| Married/living with a partner | 34735 (76) | 84.4 | 6.9 | 6.8 | 1.9 |
| Other | 11008 (24) | 76.1 | 8.9 | 11.0 | 4.0 |
| Occupational status | |||||
| Manual | 6863 (15) | 72.8 | 7.7 | 13.2 | 6.3 |
| Lower grade non-manual | 25709 (58) | 82.4 | 8.0 | 7.9 | 1.7 |
| Higher grade non-manual | 12259 (27) | 88.1 | 5.9 | 4.5 | 1.5 |
| Type of employment | |||||
| Permanent | 36710 (82) | 82.6 | 6.9 | 7.9 | 2.6 |
| Temporary | 8251 (18) | 81.3 | 9.5 | 7.8 | 1.5 |