Table 1 Quality assessment of studies according to Newcastle–Ottawa Scale (NOS)
Author | Year | Selection | Comparability | Exposure | Total Score |
|---|---|---|---|---|---|
Miyanji | 2015 | 3 | 2 | 2 | 7 |
Sarwahi | 2016 | 3 | 2 | 2 | 7 |
Zhu | 2017 | 3 | 2 | 3 | 8 |
Urbanski | 2019 | 3 | 2 | 2 | 7 |
Si | 2020 | 3 | 2 | 3 | 8 |
Yang | 2021 | 3 | 2 | 2 | 7 |
Sarwahi | 2021 | 3 | 2 | 3 | 8 |