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Quality of the included studies (n = 6).
| Study | Selection bias | Study attrition | Prognostic factor measurement | Outcome measurement | Study confounding | Statistical analysis and reporting | Overall risk |
|---|---|---|---|---|---|---|---|
| Bonetti 200817 | Low | Low | Low | Low | High | Low | Low |
| Katz-Leurer 200518 | Low | Low | Low | Low | High | Low | Low |
| Mahendran 202019 | Low | Low | Low | Low | Moderate | Low | Low |
| Nakao 202020 | Low | Moderate | Low | Low | Moderate | Low | Low |
| Park 201721 | Low | Moderate | Low | Low | Moderate | Low | Low |
| Thilarajah 202022 | Low | Low | Low | Low | Moderate | Low | Low |
