Table 6.

Evaluation of risk of bias in the individual studies.

Study	Cohort	Control or comparison group	Pre-post intervention data	Random assignment of participants to the intervention	Random selection of participants for assessment	Follow-up rate of 80% or more	Comparison groups equivalent on socio- demographics	Comparison groups equivalent on outcome measures at baseline
Auer et al.	No	Yes	Yes	NA	No	NA	NA	NR
Auer and Griffiths	No	Yes	Yes	NA	No	NA	NA	NR
Byrne and Russell	No	Yes	Yes	Yes	Yes	NA	Yes	Yes
Cloutier et al.	No	Yes	Yes	Yes	No	NA	Yes	NR
Ginley et al.	Yes	Yes	No	Yes	No	No	Yes	NR
Harris and Parke	No	No	Yes	Yes	No	NA	Yes	NR
Harris et al.	No	Yes	No	Yes	No	NA	Yes	NR
Hollingshead et al.	No	Yes	No	Yes	No	NA	Yes	NR
Jardin and Wulfert	No	Yes	No	Yes	No	NA	Yes	NR
McGivern et al.	No	Yes	No	Yes	No	NA	Yes	NR
Mizerski et al.	No	Yes	No	Yes	No	NA	Yes	NR
Monaghan and Blaszczynskia	No	Yes	No	Yes	No	NA	Yes	NR
Monaghan and Blaszczynskib	No	Yes	Yes	Yes	No	Yesc	Yes	Yes
Rockloff et al.	No	Yes	No	Yes	Yes	NA	Yes	NR
Stewart and Wohl	No	Yes	No	Yes	No	NA	Yes	NR
Tabri et al.	No	Yes	No	Yes	No	NA	Yes	NR
Wohl et al.d	No	Yes	No	Yes	No	NA	Yes	NR
Wohl et al.e	No	Yes	No	Yes	No	NA	Yes	NR
Auer et al.	No	Yes	Yes	NA	No	NA	NA	NR

NR, not reported; NA, not applicable.

^aMonaghan and Blaszczynski (39).

^bMonaghan and Blaszczynski (33).

^cOnly study 1 fulfilled this criteria.

^dWohl et al. (41).

^eWohl et al. (67).