Table 3.

Risk of bias assessment.

	Selection Bias (sequence generation)	Selection Bias (allocation concealment)	Performance Bias (blinding of subjects)	Detection Bias (blinding of outcome assessment)	Attrition Bias (handling of incomplete outcome data)	Reporting Bias (selective reporting)
Assanangkornchai et al. (101)								key
Babor et al. (79)										Low risk of bias
Kalichman et al. (95)										Unclear risk of bias
Kalichman et al. (96)										High risk of bias
L’Engle et al. (102)
Mertens et al. (97)
Nadkarni et al. (89)
Noknoy et al. (105)
Omeje et al. (87)
Pal et al. (100)
Papas et al. (112)
Peltzer et al. (93)
Pengpid et al. (103)
Pengpid et al. (104)
Rendall-Mkosi et al. (94)
Segatto et al. (88)
Sheikh et al. (90)
Shin et al. (92)
Sorsdahl et al. (98)
Wandera et al. (99)
Witte et al. (91)