Table 3.

Significance of Change during the Study Period and Effect Sizes for Efficacy Measures

	Lamotrigine	Placebo	P*	Cohen’s d
YBOCS
Obsession Mean±SD	−4.15± 2.9	−2.52± 2.9	0.045	0.5
Compulsion Mean±SD	−4.50± 3.9	−2.56± 2.7	0.038	0.45
Total Score Mean±SD	−8.73± 6.1	−5.07± 4.3	0.015	0.54

^*Mann- Whitney U Test