Table 5 Risk of bias of included studies
Study (year) | Concealed allocationa | Blinded outcome assessorsa | Intention to treata | Actual/Planned sample size (%) | Intervention and control groups comparable |
|---|---|---|---|---|---|
Bulger et al. (2011) | Low | Low | Low | 853/3726 (23%) | High |
Cooper et al. (2004) | Low | Low | Low | 229/220 (104%) | High |
Jousi et al. (2010) | Unclear | Unclear | Unclear | 37/NA (NA) | Low |
Vassar et al. (1993a) | Low | Low | Low | 194/600 (32%) | High |
Vassar et al. (1993b) | High | Low | Low | 258/600 (43%) | Low |