All | COPD and pneumoconiosis | ||||
n | % | n | % | P value | |
Overall | 675 | 100 | 221 | 32.7 | |
Pneumoconiosis | <0.001 | ||||
Asbestosis | 130 | 19.3 | 23 | 17.7 | |
Silicosis | 210 | 31.1 | 84 | 40.0 | |
Coal workers’ pneumoconiosis | 259 | 38.4 | 100 | 38.6 | |
Other pneumoconiosis | 76 | 11.3 | 14 | 18.4 | |
Age, years | 0.083 | ||||
20–29 | 3 | 0.4 | 0 | 0 | |
30–39 | 25 | 3.7 | 4 | 16.0 | |
40–49 | 164 | 24.3 | 37 | 22.6 | |
50–59 | 222 | 32.9 | 95 | 42.8 | |
60–69 | 178 | 26.4 | 60 | 33.7 | |
≥70 | 83 | 12.3 | 25 | 30.1 | |
Male | 523 | 77.5 | 177 | 33.8 | 0.258 |
Smoking history | 0.089 | ||||
Never-smoker | 290 | 43.0 | 86 | 29.7 | |
Former smoker | 183 | 27.1 | 68 | 37.2 | |
Current smoker | 202 | 29.9 | 67 | 33.2 | |
Smoking exposure, pack-years | 0.002 | ||||
0 | 290 | 43.0 | 86 | 29.7 | |
1–9 | 136 | 20.1 | 33 | 24.3 | |
10–19 | 94 | 13.9 | 34 | 36.2 | |
≥20 | 155 | 23.0 | 68 | 43.9 | |
BMI, kg/m2 | 0.228 | ||||
<18.5 | 7 | 1.0 | 3 | 42.9 | |
18.5–24.9 | 330 | 48.9 | 115 | 34.8 | |
≥25.0 | 338 | 50.1 | 103 | 30.5 | |
Duration of exposure, years | 0.046 | ||||
0–15 | 424 | 62.8 | 127 | 30.0 | |
16–30 | 198 | 29.3 | 73 | 36.9 | |
31–45 | 53 | 7.9 | 21 | 39.6 | |
Stage of pneumoconiosis | <0.001 | ||||
Ⅰ | 332 | 49.2 | 67 | 20.2 | |
Ⅱ | 164 | 24.3 | 42 | 25.6 | |
Ⅲ | 179 | 26.5 | 112 | 62.6 |
BMI, body mass index; COPD, chronic obstructive pulmonary disease.