Table 2 Evaluation of the quality of the included studies in this meta-analysis using Quality Index
First author | Year | Quality score component | Score | ||||
|---|---|---|---|---|---|---|---|
I | II | III | IV | V | Over all | ||
Li(a) | 2014 | 10 | 3 | 4 | 3 | 5 | 25 |
Wei | 2013 | 9 | 3 | 4 | 2 | 5 | 23 |
Demirok | 2013 | 9 | 3 | 4 | 4 | 5 | 25 |
Gao | 2014 | 9 | 3 | 4 | 2 | 5 | 23 |
Li(b) | 2013 | 10 | 3 | 4 | 3 | 5 | 25 |