Source of bias | Low risk | Unclear risk | High risk |
---|---|---|---|
Random sequence generation | 29 (52) | 27 (48) | 0 (0) |
Allocation concealment | 13 (23) | 42 (75) | 1 (2) |
Blinding of patients | 16 (29) | 7 (13) | 33 (59) |
Blinding of therapists | 4 (7) | 1 (2) | 51 (91) |
Blinding of outcome assessors | 22 (39) | 12 (21) | 22 (39) |
Incomplete outcome data | 17 (30) | 13 (23) | 26 (46) |