Table 1

Quality assessment results for the included studies

Authors (year)Selection biasStudy designConfoundersBlindingData collection methodsWithdrawal and dropoutsGlobal rating
Wright et al 44 (2017)ModerateStrongWeakModerateStrongModerateModerate
Lee et al 45 (2016)StrongStrongStrongModerateStrongStrongStrong
Bunner et al 41 (2015)StrongStrongStrongModerateStrongStrongStrong
Soare et al 43 (2014)StrongStrongStrongModerateStrongStrongStrong
Mishra et al 39 (2013)ModerateStrongStrongModerateStrongModerateStrong
Kahleova et al 35 (2013)StrongStrongStrongModerateStrongStrongStrong
Kahleova et al 36 (2011)StrongStrongStrongModerateStrongStrongStrong
Ferdowsian et al 40 (2010)ModerateStrongStrongModerateStrongStrongStrong
Barnard et al 37 (2009b)StrongStrongStrongModerateStrongStrongStrong
Barnard et al 38 (2009a)StrongStrongStrongModerateStrongStrongStrong
Nicholson et al 42 (1999)StrongStrongStrongModerateStrongModerateStrong