Table 1 Demographic characteristics of the pneumoconiosis patients and prevalence of COPD
Total (n = 638) |  | Subjects | Prevalence of COPD | ||
|---|---|---|---|---|---|
| Â | Â | No. | % | No. | % |
Age,years | 21–30 | 2 | 0.31% | 0 | 0% |
31–40 | 10 | 1.57% | 0 | 0% | |
41–50 | 341 | 53.45% | 42 | 12.32% | |
51–60 | 228 | 35.74% | 51 | 22.37% | |
61–70 | 40 | 6.27% | 18 | 45.00% | |
71–80 | 17 | 2.66% | 8 | 47.06% | |
BMI | Below normal | 24 | 3.76% | 10 | 41.67% |
Normal | 369 | 57.84% | 70 | 18.97% | |
Overweight | 190 | 29.78% | 29 | 15.26% | |
Obesity | 55 | 8.62% | 10 | 18.18% | |
Category | I | 352 | 55.17% | 29 | 8.24% |
II | 132 | 20.69% | 18 | 13.64% | |
III | 154 | 24.14% | 72 | 46.75% | |
Exposure time, years | 0–10 | 173 | 27.12% | 22 | 12.72% |
11–20 | 228 | 35.74% | 40 | 17.54% | |
21–30 | 186 | 29.15% | 51 | 27.42% | |
31–40 | 51 | 7.99% | 6 | 11.76% | |
Exposure type | Silicosis dust | 142 | 22.26% | 29 | 20.42% |
Coal dust | 496 | 77.74% | 90 | 18.15% | |
Air drill type | No | 300 | 47.02% | 45 | 15.00% |
Yes | 338 | 52.98% | 74 | 21.89% | |
Smoking history | Never | 167 | 26.18% | 28 | 16.77% |
Mild | 98 | 15.36% | 17 | 17.35% | |
Moderate | 80 | 12.54% | 6 | 7.5% | |
Heavy | 293 | 45.92% | 68 | 23.21% | |
Education | Below primary school | 8 | 1.25% | 1 | 12.5% |
Primary school | 197 | 30.88% | 43 | 21.83% | |
Middle school | 423 | 66.30% | 73 | 17.26% | |
High school | 6 | 0.94% | 2 | 33.33% | |
Some college | 4 | 0.63% | 0 | 0% | |