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Newcastle-Ottawa quality assessment scale for cohort studies.
| Cohort study | Selection | Comparability | Outcome | Total | |||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 1 | 2 | 3 | |||
| Joshipura et al. (2003) | ★ | ★ | ☆ | ★ | ★★ | ★ | ★ | ★ | 8 |
| Joshy et al. (2016) | ★ | ★ | ☆ | ★ | ★★ | ★ | ☆ | ★ | 7 |
| Lee et al. (2019) | ★ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 9 |
| Wu et al. (2000) | ★ | ☆ | ★ | ★ | ★★ | ★ | ★ | ★ | 8 |
