Primary outcomes
| Study ID | Antibiotic group | Placebo group | ||||
| Total | Empyema | Pneumonia | Total | Empyema | Pneumonia | |
| Grover13 | 38 | 1 | 4 | 37 | 6 | 13 |
| Stone6 | 40 | 1 | 0 | 43 | 2 | 5 |
| LeBlanc5 | 26 | 0 | 1 | 26 | 1 | 1 |
| Mandal14 | 40 | 0 | 0 | 40 | 1 | 0 |
| LoCurto15 | 30 | 0 | 0 | 28 | 5 | 4 |
| Brunner20 | 44 | 0 | 1 | 46 | 6 | 3 |
| Cant16 | 57 | 0 | 7 | 56 | 5 | 19 |
| Nichols19 | 63 | 0 | 0 | 56 | 4 | 3 |
| Gonzalez17 | 71 | 0 | 0 | 68 | 2 | 2 |
| Maxwell7 | 153 | 2 | 12 | 71 | 4 | 2 |
| Villegas Carlos18 | 63 | 3 | N/A | 63 | 5 | N/A |
| Heydari12 | 54 | 0 | 2 | 50 | 1 | 4 |
| Total | 679 | 7 (1%) | 27 (4.4%) | 584 | 42 (7.2%) | 56 (10.7%) |
Values in parenthesis are percentages.