Table 1 Demographic and occupational factors and current smoking status
| Â | n (%) | Current smoker n (%) | Current nonsmoker n (%) | p value |
|---|---|---|---|---|
All | 1956 (100) | 1025 (52.4) | 931 (47.6) | Â |
Age (years) | Â | Â | Â | < 0.001 |
 ≤35 | 559 (28.6) | 241 (43.1) | 318 (56.9) |  |
 36–45 | 752 (38.4) | 417 (55.5) | 335 (44.5) |  |
 ≥46 | 645 (33.0) | 367 (56.9) | 278 (43.1) |  |
Marital status | Â | Â | Â | 0.001 |
 Single/divorced/widowed/separated | 347 (17.7) | 155 (44.7) | 192 (55.3) |  |
 Married/cohabiting | 1609 (82.3) | 870 (54.1) | 739 (45.9) |  |
Education | Â | Â | Â | <0.001 |
 Junior high school or under | 897 (45.9) | 534 (59.5) | 363 (40.5) |  |
 Senior high school/technical secondary school or above | 1059 (54.1) | 491 (46.4) | 568 (53.6) |  |
Job rank | Â | Â | Â | 0.058 |
 Head miner | 388 (19.8) | 220 (56.7) | 168 (43.3) |  |
 Staff miner | 1568 (80.2) | 805 (51.3) | 763 (48.7) |  |
Occupational category | Â | Â | Â | 0.949 |
 Mining/tunneling | 1049 (53.6) | 549 (52.3) | 500 (47.7) |  |
 Supporting | 907 (46.4) | 476 (52.5) | 431 (47.5) |  |
ERI | Â | Â | Â | 0.236 |
 Low | 652 (33.3) | 324 (49.7) | 328 (50.3) |  |
 Intermediate | 653 (33.4) | 350 (53.6) | 303 (46.4) |  |
 High | 651 (33.3) | 351 (53.9) | 300 (46.1) |  |
PPE | Â | Â | Â | 0.009 |
 Low | 647 (33.1) | 310 (47.9) | 337 (52.1) |  |
 Intermediate | 657 (33.6) | 370 (56.3) | 287 (43.7) |  |
 High | 652 (33.3) | 345 (52.9) | 307 (47.1) |  |