Characteristics | No. of ME studyb | % (95% CI) |
---|---|---|
Data sourcesc | ||
Cochrane review only | 28/58 | 48 (35 to 62) |
Non-Cochrane review only | 3/58 | 5 (0 to 11) |
Non-Cochrane review published in “high impact factor” journals | 1/58 | 2 (0 to 5) |
Both Cochrane and non-Cochrane review | 27/58 | 47 (33 to 60) |
Non-Cochrane review published in “high impact factor” journals and Cochrane | 8/58 | 14 (5 to 23) |
Type of meta-analyses | ||
Aggregated data only | 58 | 92 (85 to 99) |
Aggregated and individual participant data | 3 | 5 (0 to 10) |
Individual participant data only | 1 | 2 (0 to 5) |
Network of aggregated data only | 1 | 2 (0 to 5) |
Management of overlapping meta-analyses | 35 | 56 (43 to 68) |
Reported minimum No. of trials included in each meta-analysis | 37 | 59 (46 to 71) |
Minimum No. of trials included in meta-analysis, median (Q1, Q3)d, rangee | 3 (2,4) | 1 to 10 |
Criteria of selecting one meta-analysis within each systematic reviewf | ||
Primary outcome | 10/44 | 23 (10 to 36) |
Largest number of studies | 4/44 | 9 (0 to 18) |
Objective | 3/44 | 7 (0 to 15) |
First outcome | 2/44 | 4 (0 to 11) |
Othersg | 5/44 | 11 (2 to 21) |
More than one method | 20/44 | 45 (30 to 61) |
Data extraction sourcesc | ||
From individual trial | 19/60 | 32 (20 to 44) |
From meta-analysis | 8/60 | 13 (4 to 22) |
Both | 33/60 | 55 (42 to 68) |