Pitfall | Total (N = 81) | Year 2002 (N = 29) | Year 2012 (N = 52) |
---|---|---|---|
Ecological fallacy | 53 (65%, 55 to 75%) | 20 (69%, 51 to 83%) | 33 (63%, 50 to 75%) |
Overfitting | 14 (17%, 11 to 27%) | 6 (21%, 10 to 38%) | 8 (15%, 8 to 28%) |
Meta-regression on risk of the analysed outcome | 5 (6%, 3 to 14%) | 2 (7%, 2 to 22%) | 3 (6%, 2 to 16%) |
Any potential meta-regression pitfall | 57 (70%, 60 to 79%) | 21 (72%, 54 to 85%) | 36 (69%, 56 to 80%) |