AMSTAR Criterion | Zhang et al 201518 | Piper et al 201319 | Endara et al 201320 | De La Cruz et al 201521 |
---|---|---|---|---|
1. Was an ‘a priori’ design provided? | NO | NO | NO | NO |
2. Was there duplicate study selection and data extraction? | NO (only data extraction) | NO | YES | YES |
3. Was a comprehensive literature search performed? | NO (single database only) | NO (only two databases) | NO (only two databases) | YES |
4. Was the status of publication (i.e, grey literature) used as an inclusion criterion? | NO | NO | NO | NO |
5. Was a list of studies (included and excluded) provided? | NO (included only) | NO (included only) | NO | NO |
6. Were the characteristics of the included studies provided? | YES | YES | YES | YES |
7. Was the scientific quality of the included studies assessed and documented? | NO | NO | YES | NO |
8. Was the scientific quality of the included studies used appropriately in formulating conclusions? | NO | NO | YES | YES |
9 Were the methods used to combine the findings of studies appropriate? | YES | NA | YES | YES |
10. Was the likelihood of publication bias assessed? | YES | NO | NO | NO |
11. Was the conflict of interest stated? | YES | YES | YES | YES |
Total | 4 | 2 | 6 | 6 |
NA, not available.