Table 2.
Quality assessment of randomized controlled trials examining the effects of e-cigarettes on lung function, as defined by the Cochrane Collaboration Risk of Bias tool (version 1).
| Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other bias | |
|---|---|---|---|---|---|---|---|
| Ferrari 2015 | Unclear | Unclear | Low | Low | Unclear | Low | High |
| Boulay 2017 | Unclear | Unclear | Low | Unclear | Low | Unclear | Unclear |
| Staudt 2018 | Unclear | Unclear | Low | Unclear | Low | Low | Low |