Table 3 Original Cochrane authors’ risk of bias assessments and our new assessments
From: Tolerating bad health research (part 2): still as many bad trials, but more good ones too
Random sequence generation | Low | Unclear | High |
|---|---|---|---|
Original | 80 (57%) | 55 (39%) | 5 (4%) |
New | 89 (64%) | 49 (35%) | 2 (1%) |
Allocation concealment | Low | Unclear | High |
Original | 67 (48%) | 68 (49%) | 5 (4%) |
New | 76 (54%) | 63 (45%) | 1 (1%) |
Blinding of participants and personnel | Low | Unclear | High |
Original | 57 (41%) | 35 (25%) | 46 (33%) |
New | 70 (50%) | 18 (13%) | 52 (37%) |
Blinding of outcome assessors | Low | Unclear | High |
Original | 65 (46%) | 45 (32%) | 30 (21%) |
New | 78 (56%) | 28 (20%) | 34 (24%) |
Incomplete data outcome | Low | Unclear | High |
Original | 81 (58%) | 32 (23%) | 27 (19%) |
New | 93 (66%) | 21 (15%) | 26 (19%) |
Selective reporting | Low | Unclear | High |
Original | 57 (41%) | 52 (38%) | 29 (21%) |
New | 105 (75%) | 25 (18%) | 10 (7%) |
Other bias | Low | Unclear | High |
Original | 52 (53%) | 29 (29%) | 18 (18%) |
New | 127 (91%) | 1 (1%) | 12 (9%) |
Overall bias | Low | Unclear | High |
Original | 12 (8.5%) | 47 (34%) | 81 (58%) |
New | 22 (15.7%) | 41 (29%) | 77 (55%) |