Study | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Comments |
---|
Forman DE | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | A |
Harzand A | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | B |
Laustsen L | Yes | Yes | Yes | No | Yes | Yes | Yes | Yes | Yes | B |
Widmer RJ | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | Yes | A |
- Key: 1: Clear description of “cause” and “effect”; 2: Similar participants included in comparisons; 3: Similar treatment or care other than the exposure in comparisons; 4: There was a control group; 5: Multiple measurements of the outcome; 6: Complete follow-up or strategies to deal with incomplete follow up; 7: Outcome measured in the same way for comparisons; 8: Outcome measured in a reliable way; 9: Appropriate statistical analysis