Study | Risk of Bias | Applicability | Overall | ||||||
Participants | Predictors | Outcome | Analysis | Participants | Predictors | Outcome | Risk of Bias | Applicability | |
1 | + | + | + | + | + | + | + | + | + |
2 | – | + | + | + | + | +/− | + | +/− | +/− |
3 | +/− | + | + | + | + | + | + | + | + |
4 | + | + | + | + | + | + | + | + | + |
(+) indicate low risk of bias, (±) indicate low/moderate risk of bias, (−) indicate high risk of bias.