Table 2.

Description and overall effect of CBT trials included in the meta-analysis

Study	CBT Modality	Primary Outcome Measure	N	Effect Size
Barrett et al (2004)	RCT Family CBT	CY-BOCS	(26)	2.76
POTS (2004)	RCT Individual CBT	CY-BOCS	28	2.53
Bolton (1983)	Open Individual CBT	Severity Rating	15	2.45
de Haan et al (1998)	RCT Individual CBT	CY-BOCS	12	1.94
Piacentini et al (2002)	Open Individual CBT	NIMHOCS	42	1.72
Benazon et al (2002)	Open Individual CBT	CY-BOCS	16	1.58
Franklin et al (1998)	Open Individual CBT	CY-BOCS	14	1.13
Thienemann et al (2001)	Open Group CBT	CY-BOCS	18	1.09
Martin & Thienemann (2005)	Open Family CBT	CY-BOCS	14	0.98
March et al (1994)	Open Individual CBT	CY-BOCS	15	0.95
Himle et al (2003)	Open Group CBT	CY-BOCS	19	0.78
Fischer et al (1998)	Open Group CBT	CY-BOCS	15	0.54

Note: Due to two family CBT arms in Barrett et al, a weighted average of effect size and N were used in computation.