| Ref (type) | Population | Outcome, Interventions | Results and statistical analysis | Effect size | Favours |
| Resolution | |||||
|
RCT |
30 people with spontaneous pneumothorax and respiratory distress |
Rate of resolution (complete or nearly complete expansion)
48 hours
15/17 (88%) with chest tube (13 French gauge) connected to a one-way valve 11/13 (85%) with chest tube (14 French gauge) connected to a drainage bottle with an underwater seal |
RR 1.04 95% CI 0.78 to 1.39 |
Not significant |
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