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The demographic features of all groups.
| Groups | Study group (n(%)) | Age (year, mean ± SE) | Gender (F/M) |
| Transudates | 9 (25) | 7.1 ± 0.9 | 5/4 |
| Exudates | 27 (75) | 5.1 ± 0.6 | 8/19 |
| Parapneumonic | 12 (44) | 5.4 ± 0.8 | 4/8 |
| Empyema | 12 (44) | 4.2 ± 0.8 | 3/9 |
| Tuberculous | 3 (12) | 8.5 ± 3.5 | 1/2 |
| Total | 36 | 5.6 ± 0.5 | 13/23 |
