Table 2

Study rigour

Study	Study design includes preintervention/postintervention data	Study design includes control or comparison group	Study design includes cohort	Comparison groups equivalent at baseline on sociodemographics	Comparison groups equivalent at baseline on outcome measures	Random assignment (group or individual) to the intervention	Participants randomly selected for assessment	Control for potential confounders	Follow-up rate
Church et al 28	No	Yes	No	N/A	N/A	No	Yes	Yes	N/A
Coyne et al 25	Yes	No	No	N/A	N/A	No	No	No	N/A
Hamlyn et al 26	Yes	No	No	No (except for age)	N/A	No	No	No	N/A