|
1. Was an a priori design provided? | 12 | 1 | 0 |
2. Was a comprehensive literature search performed? | 5 | 5 | 3 |
3. Is it possible to replicate the search? | 8 | 5 | 0 |
4. Did the inclusion criteria permit gray literature? | 0 | 10 | 3 |
5. Was a list of studies (included and excluded) provided? | 0 | 0 | 13 |
6. Were the characteristics of the included studies provided? | 13 | 0 | 0 |
7. Was the scientific quality of the included studies assessed and documented? | 8 | 5 | 0 |
8. Were the methods used to combine the findings of studies appropriate? | 13 | 0 | 0 |
9. Was the effect size index chosen justified statistically? | 9 | 4 | 0 |
10. Was the likelihood of publication bias assessed? | 10 | 0 | 3 |
11. Was the conflict of interest included? | 6 | 0 | 7 |