In the primary intention-to-treat analyses , DCS did not augment the effects of CBT compared with placebo ( mean -LSB- SD -RSB- clinician-rated Y-BOCS score , DCS : @ -LSB- @ -RSB- at week @ and @ -LSB- @ -RSB- at @-month follow-up ; placebo : @ -LSB- @ -RSB- at week @ and @ -LSB- @ -RSB- at @-month follow-up ) but showed a significant interaction with antidepressants ( clinician-rated Y-BOCS , B = -@ ; Z = -@ ; P = @ ) .