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Newcastle–Ottawa Scale for risk of bias assessment of cohort studies included in the meta-analysis
| Study | Selection | Comparability | Outcome | Overall | |||||
|---|---|---|---|---|---|---|---|---|---|
| Representativeness of exposed cohort | Selection of non-exposed | Ascertainment of exposure | Outcome not present at start | Assessment of Outcome | Adequate Follow-Up Length | Adequacy of Follow-Up | |||
| Huang [27] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | 9 | |
| Guo [28] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ☆ | 8 |
| Abate [29] | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | 9 | |
| Palco [30] | ★ | ★ | ★ | ★ | ★ | ★ | ★ | ☆ | 7 |
