Table 2

Quality appraisal of studies

RCTs*Neu et al,35 2014Wiberg and Wiberg,45 1999Hayden and Mullinger,33 2006Miller et al,34 2012Olafsdottir et al,36 2001Browning and Miller,32 2008Herzaft-Le Roy et al,38 2017
 1. Sequence generationLLLLULL
 2. Allocation concealmentLUULLUL
 3. Blinding of parentsLHHLLLL
 4. Blinding of outcome assessorsLLHLLLL
 5. Incomplete outcome dataLHLHULL
 6. Selective outcome reportingLULLULH
Quality assessment High Low Mod High Mod High High