Table 2 Quality assessment of studies included in this meta-analysis based on the Newcastle-Ottawa scale
Author, yr | Selection | Comparability | Exposure | Score | |||||
|---|---|---|---|---|---|---|---|---|---|
An adequate definition of case | Representativeness of the case | Selection of controls | Definition of controls | Cases and controls matched and/or adjusted by factors | Assessment of exposure | The same method of ascertainment for cases and controls | The same response rate for both groups | ||
Cheng et al., 2022 [8] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
Farhat et al., 2016 [20] | ★ | ★ | – | ★ | ★ | ★ | ★ | – | 6 |
Hansen et al., 2010 [13] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ★ | 8 |
Nobles et al., 2018 [21] | ★ | ★ | ★ | ★ | ★ | ★ | - | 6 | |
Qiu et al., 2020 [22] | ★ | ★ | ★ | ★ | ★ | ★ | - | ★ | 7 |
Radwan et al., 2016 [23] | ★ | ★ | – | ★ | ★ | ★ | ★ | ★ | 7 |
Wu et al., 2017 [9] | ★ | ★ | - | ★ | ★ | ★ | ★ | s | 7 |
Yang et al.,2021 [24] | ★ | ★ | ★ | ★ | ★ | – | ★ | – | 6 |
Zhou et al., 2020 [25] | ★ | ★ | – | ★ | ★★ | – | ★ | ★ | 7 |