Selection bias | Study design | Confounders | Blinding | Data collection | Withdrawals | Global rating | |
---|---|---|---|---|---|---|---|
1. Duffy et al4 | Weak | Strong | Strong | Moderate | Weak | Strong | Weak |
2. Gosselin et al27 | Moderate | Strong | Weak | Moderate | Weak | Moderate | Weak |
3. Gritz et al15 28 | Moderate | Strong | Strong | Weak | Strong | Moderate | Moderate |