Table 3.

Yusuf criteria on quality of subgroup analyses (for cluster randomized controlled trials (CRTs) and randomized controlled trials (RCTs) with subgroup analysis)

Yusuf criteria	Cluster RCTs N = 25	Individual RCTs N = 49	Total N = 74
	(%)	(%)	N (%)
Subgroup analysis pretested or planned a priori to the study commencement	68	67	50 (68)
Hypothesis or rationale for the analysis provided	60	61	45 (61)
Statistical test for interaction performed between the subgroups	80	70	54 (73)
Overall treatment results emphasized more than the findings of the subgroup analysis	64	73	52 (70)