Table 2. School-based intervention in children with hyperkinetic disorder^*.

Symptom	Informant	Number of studies/sample (total)	Cohen’s d	95% confidence interval	p value
Inattention	Parent	7 (384)	0.13	[–0.14; 0.40]	0.33
	Teacher	12 (548)	0.60	[0.14; 1.06]	<0.001
	Child	7 (292)	0.44	[0.18; 0.70]	0.32
Hyperactivity/impulsivity	Parent	7 (285)	0.16	[–0.07; 0.39]	0
	Teacher	16 (700)	0.23	[–0.03; 0.49]	0.08
	Child	8 (411)	0.33	[0.13; 0.53]	0.001
HKD symptoms combined	Parent	3 (110)	0.14	[–0.46; 0.75]	0.65
	Teacher	6 (218)	0.16	[–0.22; 0.54]	0.42

^*Effect sizes of randomized controlled studies on measures of hyperkinetic disorder (14)

HKD, hyperkinetic disorder