Table 5 AMSTAR scores of the included studies
Items | Khan RJ (2005) | Khan RJ (2010) | McMahon SE (2011) | Jones MP (2012) |
|---|---|---|---|---|
1. Was an a priori design provided? | 0 | 1 | 0 | 1 |
2. Was there duplicate study selection and data extraction? | 1 | 1 | 1 | 1 |
3. Was a comprehensive literature search performed? | 1 | 1 | 1 | 1 |
4. Was the status of publication (i.e., grey literature) used as an inclusion criterion? | 0 | 1 | 1 | 1 |
5. Was a list of studies (included and excluded) provided? | 1 | 1 | 0 | 1 |
6. Were the characteristics of the included studies provided? | 0 | 1 | 1 | 1 |
7. Was the scientific quality of the included studies assessed and documented? | 1 | 1 | 1 | 1 |
8. Was the scientific quality of the included studies used appropriately in formulating conclusions? | 1 | 1 | 1 | 1 |
9. Were the methods used to combine the findings of studies appropriate? | 1 | 1 | 1 | 1 |
10. Was the likelihood of publication bias assessed? | 0 | 0 | 1 | 0 |
11. Was the conflict of interest stated? | 1 | 1 | 1 | 1 |
Total scores | 7 | 10 | 9 | 10 |