AMSTAR item | Atlantis 2014 [23] | Huang 2013 [24] | Joshi 2014 [25] | Smith 2016 [26] | Watson 2013 [27] |
---|---|---|---|---|---|
1. ‘A priori’ design | No | No | Yes | Yes | Yes |
2. Duplicate study selection and data extraction | Can’t answer | Can’t answer | No | Yes | Yes |
3. Literature search | Yes | Yes | Yes | Yes | Yes |
4. Status of publication | No | Can’t answer | No | Yes | Yes |
5. List of studies | Yes | No | No | Yes | Yes |
6. Characteristics of included studies | Yes | Yes | Yes | Yes | Yes |
7. Scientific quality | Yes | Yes | No | Yes | Yes |
8. Formulation of conclusion | No | No | No | Yes | Yes |
9. Methods used to combine findings | Yes | Yes | Yes | Yes | Yes |
10. Likelihood of publication bias | Yes | Yes | No | Yes | No |
11. Conflict of interest | No | Can’t answer | No | No | Yes |
Quality score | 6 | 5 | 4 | 11 | 10 |
Quality rating | Medium | Medium | Medium | High | High |