| N (%) | ||
---|---|---|---|
Quality of studies N = 67 | Low risk | High risk | Unclear |
Sequence generation | 42 (62.7) | Â | 25 (37.3) |
Allocation concealment | 32 (47.8) | Â | 35 (52.2) |
Blinding | 31 (46.3) | Â | 36 (53.7) |
Incomplete Outcome data | 52 (77.6) | 1 (1.5) | 14 (20.9) |
Selective reporting | 57 (85.1) | 7 (10.4) | 3 (4.5) |
Other bias | 53 (79.1) | Â | 14 (20.9) |