| Primary pleural drainage strategy | Hazard | Estimated change in LOS (%) | 95% CI | p Value |
| Length of stay at tertiary centre | ||||
| Chest drain and fibrinolysis | Reference | |||
| Chest drain alone | 0.56 | +44% | 0.36 to 0.87 | 0.011 |
| VATS | 0.81 | +19% | 0.46 to 1.45 | 0.49 |
| Thoracotomy | 1.28 | −28% | 0.88 to 1.85 | 0.20 |
| Total hospital stay | ||||
| Chest drain and fibrinolysis | Reference | |||
| Chest drain alone | 0.64 | +36% | 0.41 to 1.01 | 0.053 |
| VATS | 0.82 | +18% | 0.45 to 1.47 | 0.48 |
| Thoracotomy | 1.40 | −40% | 0.95 to 2.08 | 0.093 |