Table 3.
Quality rating scores for included studies.
| Author | Selection bias | Study design | Confounders | Blinding | Data collection method | Withdrawals and dropouts | Overall rating |
|---|---|---|---|---|---|---|---|
| Daniel et al. | Moderate | Moderate | Moderate | Weak | Moderate | Moderate | Moderate |
| Foulds et al. | Weak | Moderate | Moderate | Weak | Strong | Weak | Weak |
| Gray-Donald et al. | Moderate | Moderate | Strong | Weak | Strong | Weak | Weak |
| Heffernan et al. | Moderate | Moderate | N/A | N/A | Weak | Weak | Weak |
| Ho et al. | Moderate | Moderate | Strong | Weak | Strong | Moderate | Moderate |
N/A, not applicable.