Table 1 Quality assessment of the studies included according to newcastle-ottawa scale
Author | Year | Selection | Comparability | Exposure | Total Score |
|---|---|---|---|---|---|
Cheng | 2021 | 3 | 2 | 3 | 8 |
Wu | 2021 | 3 | 2 | 3 | 8 |
Li | 2021 | 3 | 2 | 3 | 8 |
Jones | 2021 | 4 | 2 | 3 | 9 |
Cai | 2021 | 3 | 2 | 3 | 8 |
He | 2020 | 3 | 2 | 3 | 8 |
Chen | 2019 | 3 | 2 | 3 | 8 |
Parker | 2017 | 4 | 2 | 3 | 9 |
Malham | 2017 | 3 | 1 | 3 | 7 |
Aichmair | 2017 | 3 | 2 | 3 | 8 |
Malham | 2012 | 3 | 2 | 3 | 8 |
Kim | 2012 | 3 | 1 | 3 | 7 |
Sharma | 2011 | 3 | 1 | 3 | 7 |