Study
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1
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2
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3
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4
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5
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6
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7
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8
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9
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Comments
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Forman DE
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Yes
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Yes
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Yes
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No
|
Yes
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Yes
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Yes
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Yes
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Yes
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A
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Harzand A
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Yes
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Yes
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Yes
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No
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Yes
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Yes
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Yes
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Yes
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Yes
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B
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Laustsen L
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Yes
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Yes
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Yes
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No
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Yes
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Yes
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Yes
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Yes
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Yes
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B
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Widmer RJ
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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Yes
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A
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- 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