Table 2.

Intensity of parental involvement and effectiveness at end of intervention or at interim and 2-year post-intervention

Type of studies	Intensity of parental involvement	End of intervention or at interim			>2-year post-intervention			No data (n = 12)
		Studies (n = 24)	Effective studies (n = 18)	Ineffective studies (n = 6)	Studies (n = 24)	Effective studies (n = 8)	Ineffective studies (n = 4)
	Primary prevention	Low parental involvement	4	3	1	4	1	1	2
		Unclear parental involvement	2	2	0	2	2	0	0
	Treatment	Low parental involvement	1	0	1	1	0	1	0
		Medium parental involvement	6	4	2	6	1	1	4
		High parental involvement	11	9	2	11	4	1	6