Table 4

Methodological quality for included studies

Author, yearSelection biasStudy designConfoundersBlindingData collection methodsWithdrawals and dropouts
Alhassan et al, 201248 WeakStrongStrongModerateModerateStrong
Alhassan et al, 201351 WeakStrongStrongModerateModerateStrong
Annesi et al, 201352 ModerateStrongWeakModerateStrongWeak
Birken et al, 201264 ModerateStrongStrongStrongWeakStrong
Campbell et al, 201354 ModerateStrongStrongStrongModerateStrong
Cardon et al, 200959 ModerateStrongWeakModerateModerateStrong
De Bock et al, 201365 StrongStrongStrongModerateWeakModerate
De Craemer et al, 201661 WeakStrongWeakModerateModerateStrong
Dennison et al, 200441 ModerateStrongStrongModerateWeakModerate
Evans et al, 201142 ModerateStrongWeakModerateWeakWeak
Fitzgibbon et al, 200544 ModerateStrongStrongWeakWeakWeak
Fitzgibbon et al, 200645 ModerateStrongStrongWeakWeakStrong
Fitzgibbon et al, 201146 ModerateStrongStrongModerateWeakModerate
Fitzgibbon et al, 201343 ModerateStrongWeakModerateWeakStrong
Haines et al, 201339 WeakStrongStrongModerateWeakStrong
Hinkley et al, 201555 WeakStrongWeakStrongStrongWeak
Jones et al, 201558 ModerateStrongWeakModerateStrongStrong
Knowlden et al, 201553 ModerateStrongStrongModerateStrongStrong
Lerner-Geva et al, 201568 ModerateStrongStrongModerateWeakWeak
Natale et al, 201440 ModerateStrongWeakModerateStrongWeak
O'Dwyer et al, 201263 WeakStrongStrongModerateModerateStrong
O'Dwyer et al, 201362 WeakStrongStrongWeakModerateStrong
Østbye et al, 201249 WeakStrongStrongModerateWeakModerate
Puder et al, 201166 StrongStrongStrongModerateStrongStrong
Skouteris et al, 201557 ModerateStrongWeakModerateWeakStrong
Taveras et al, 201147 WeakStrongStrongModerateModerateStrong
van Grieken 201467 WeakStrongStrongModerateWeakWeak
Verbestel et al, 201360 WeakStrongStrongModerateWeakModerate
Wen et al, 201256 ModerateStrongStrongStrongModerateModerate
Yilmaz et al, 201569 ModerateStrongStrongStrongWeakStrong
Zimmerman et al, 201250 WeakStrongStrongModerateModerateModerate