Demographic and smoking characteristics of cases and controls
| Characteristic | Cases (n=110) | Controls (n=102) |
| Age (mean) (SD) | ||
| Male | 61.4 (9) | 62.6 (8) |
| Female | 62.5 (9) | 58.5 (11) |
| Sex, n (%) | ||
| Male | 96 (87) | 91 (89) |
| Female | 14 (13) | 11 (11) |
| Smoking status, n (%) | ||
| Non-smokers | 8 (7) | 27 (26) |
| Ex-smokers | 79 (72) | 47 (46) |
| Current smokers | 23 (21) | 28 (27) |
| TB status | ||
| History of TB | 17 (15) | 2 (2) |
TB, tuberculosis.