Table 3.
Association between ISEBHB and anthracosis in trend analysis (control chosen from surgical ward)
| Variables | Cases (%) (n=83) | Controls (%) (n=72) | P value |
|---|---|---|---|
| Indoor exposure* (Y/N) | 55 (66.3) | 22 (30.6) | <0.001 |
| Frequency of Indoor exposure (per week)** | 3.71 (2.72) | 2.28 (1.27) | 0.04 |
| No exposure | 28 (33.7) | 50 (69.4) | <0.001 |
| Once | 7 (8.4) | 4 (5.6) | |
| Twice | 20 (24.1) | 12 (16.7) | |
| >3 times | 28 (33.7) | 6 (8.3) | |
| Duration of Indoor exposure (years)** | 22.54 (13.7) | 15.38 (13.20) | 0.05 |
| No exposure | 28 (33.7) | 50 (69.4) | <0.001 |
| 0-10 years | 14 (16.9) | 15 (20.8) | |
| 11-20 years | 20 (24.1) | 3 (4.2) | |
| 20+ years | 21 (25.3) | 4 (5.6) |
**Indoor smoke exposure due to baking home-made bread; **Data for the frequency of indoor smoke and duration of indoor smoke are mean (SD)