Table 2 Risk of bias assessment
Domain | Potential bias | Studies |
|---|---|---|
1. Study participation | Yes Partly No Unsure | Ford et al., Bae et al. Ye et al. Chen et al., Xie et al., Johnstone et al., Ryan et al., Gouliouris et al., Kramer et al. None |
2. Study attrition | Yes Partly No Unsure | None Chen et al. Ford et al., Xie et al., Ye et al., Johnstone et al., Ryan et al., Gouliouris et al., Kramer et al., Bae et al. None |
3. Prognostic factor measurement | Yes Partly No Unsure | None None Chen et al., Ford et al., Xie et al., Ye et al., Johnstone et al., Ryan et al., Gouliouris et al., Kramer et al., Bae et al. None |
4. Outcome measurement | Yes Partly No Unsure | None None Chen et al., Ford et al., Xie et al., Ye et al., Johnstone et al., Ryan et al., Gouliouris et al., Kramer et al., Bae et al. None |
5. Confounding measurement and account | Yes Partly No Unsure | Ford et al., Bae et al. Ye et al. Chen et al., Xie et al., Johnstone et al., Ryan et al., Gouliouris et al., Kramer et al. None |
6. Analysis | Yes Partly No Unsure | None None Chen et al., Ford et al., Xie et al., Ye et al., Johnstone et al., Ryan et al., Gouliouris et al., Kramer et al., Bae et al. None |