Table 1. Patient characteristics and underlying conditions.
| Characteristic/condition | Number | Percentage |
| Sex, male/female | 21/14 | |
| Age (years) | ||
| Range | 30–89 | |
| Mean | 66.9 | |
| Community-acquired | 6 | 17.1 |
| Nosocomial | 29 | 82.9 |
| Underlying conditions | ||
| Smoking habit | 11 | 31.4 |
| Cardiac disease | 8 | 22.9 |
| Alcoholic | 7 | 20.0 |
| Diabetes mellitus | 7 | 20.0 |
| Pulmonary emphysema | 6 | 17.1 |
| Collagen disease | 2 | 5.7 |
| Bronchial asthma | 2 | 5.7 |
| Malignancy | 13 | 37.1 |
| Presenting symptoms | ||
| Fever | 32 | 91.4 |
| Cough | 28 | 80.0 |
| Sputum | 28 | 80.0 |
| Dyspnoea | 25 | 71.4 |
| General weakness | 7 | 20.0 |
| Disturbance of consciousness | 5 | 14.3 |
| Chest pain | 4 | 11.4 |