Table 11 Distribution of habitual exposure with severity grouping
Habitual | Severity grouping | |||
|---|---|---|---|---|
Exposure | Group A (%) | Group B (%) | Group C (%) | Group D (%) |
Smokers | 18 (9.1) | 28 (14.2) | 11 (5.6) | 36 (18.3) |
Ex-smokers < 6 months | 3 (1.5) | 6 (3.0) | 1 (0.5) | 3 (1.5) |
Ex-smokers > 6 months | 11 (5.6) | 18 (9.1) | 9 (4.6) | 27 (13.7) |
Non-smokers | 5 (2.5) | 8 (4.1) | 6 (3.0) | 7 (3.5) |
Total | 37 (18.8) | 60 (30.5) | 27 (13.7) | 73 (37.0) |