Total (n = 152) | Cochrane (n = 75) | Non-Cochrane (n = 77) | |
---|---|---|---|
Number of authors | 5 (4 to 7) | 5 (4 to 6) | 6 (4 to 9) |
Update of a previous review | 38 (25%) | 38 (51%) | 0 (0%) |
Iteration of the update | |||
First | 15 (10%) | 15 (20%) | 0 (0%) |
Second | 9 (6%) | 9 (11%) | 0 (0%) |
Third | 10 (7%) | 10 (13%) | 0 (0%) |
Fourth | 4 (3%) | 4 (5%) | 0 (0%) |
Number of included studies | 11 (4.75 to 20) | 6 (3 to 18) | 15 (9 to 21) |
Review Registered | n/a | n/a | 36 (47%) |
Protocol available | 68 (45%) | 67 (89%) | 1 (1%) |
Reported adherence to PRISMAa | 63 (41%) | 1 (1%) | 62 (81%) |
Country of corresponding author | |||
Australia | 8 (5%) | 8 (11%) | 0 (0%) |
Canada | 16 (11%) | 9 (12%) | 7 (9%) |
China | 22 (14%) | 1 (1%) | 21 (27%) |
UK | 26 (17%) | 19 (25%) | 7 (9%) |
USA | 18 (12%) | 6 (8%) | 12 (16%) |
Other | 62 (41%) | 32 (43%) | 30 (39%) |
Funding source | |||
Non-commercial | 98 (64%) | 66 (88%) | 32 (42%) |
Commercial | 1 (1%) | 0 (0%) | 1 (1%) |
No funding | 25 (16%) | 3 (4%) | 22 (29%) |
Not reported | 28 (18%) | 6 (8%) | 22 (29%) |
Data extraction form published | |||
Yes | 10 (7%) | 7 (9%) | 3 (4%) |
No | 142 (93%) | 68 (91%) | 74 (96%) |
Number of reviewers involved in data extraction | |||
1 | 1 (1%) | 0 (0%) | 1 (1%) |
2 | 74 (49%) | 36 (48%) | 38 (49%) |
3 | 22 (14%) | 18 (24%) | 4 (5%) |
4 | 8 (5%) | 6 (8%) | 2 (3%) |
> 4 | 12 (8%) | 9 (12%) | 3 (4%) |
Not reported | 35 (23%) | 6 (8%) | 29 (38%) |