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Newcastle-ottawa quality assessment scale for case-control studies.
| Case-control study | Selection | Comparability | Exposure | Total | |||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 1 | 2 | 3 | |||
| Grau et al. (2004) | ★ | ★ | ☆ | ★ | ★★ | ★ | ★ | ☆ | 7 |
| Leao et al. (2021) | ★ | ★ | ☆ | ★ | ★★ | ★ | ☆ | ★ | 7 |
| Palm et al. (2014) | ☆ | ★ | ★ | ★ | ★★ | ★ | ★ | ★ | 8 |
