Table 3.

Risk of bias and quality assessment for process research.

Questions	64	65	66	67	68	69	70	71	72	73	74	75	76	77
Were there clear research questions?	+	+	+	+	+	+	+	+	+	+	+	+	+	+
Did the collected data allow to address the research questions?	+	+	+	+	+	+	+	+	+	+	+	+	+	+
Was randomisation appropriately performed?	+	+	+	+	±	+	+	+	±	+	+	+	+	+
Were the groups comparable at baseline?	+	+	+	+	±	+	+	+	+	+	+	+	+	+
Were outcome assessors blinded to the intervention provided?	+	+	±	+	-	+	+	+	+	+	±	±	+	±
Did the participants adhere to the assigned intervention?	+	+	+	+	±	+	+	+	±	+	+	+	+	+

Yes (+), unclear (±), no (–).

Dadds et al. (56); De Bruin et al. (57); Dekovic et al. (58); Eddy and Chamberlain (59); Fosco et al. (68); Gonzales et al. (69); Henggeler et al. (60); Henggeler et al. (61); Hogue et al. (62); Huey et al. (63); Jensen et al. (64); Pantin et al. (65); Paquete and Vitaro (66); Van Ryzin and Leve (67).