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Underlying conditions in medical and habitual history (CRF: chronic renal failure, COPD: chronic obstructive pulmonary disease).
| Predisposing factors in medical and habitual history | Frequency |
|---|---|
| Smoking | 22 (64.7%) |
| Opium consumption | 10 (29.4%) |
| Alcohol abuse | 2 (5.9%) |
| Malignancy | 1 (2.9%) |
| CRF | 1 (2.9%) |
| Diabetes mellitus | 12 (35.3%) |
| Immunodeficiency | 1 (2.9%) |
| TB history | 14 (41.2%) |
| Cardiac disease | 13 (38.2%) |
| Chest wall deformity | 12 (35.3%) |
| COPD | 6 (17.6%) |
| Cystic fibrosis | 7 (20.6%) |
