Fig. 2From: Mechanisms of exposure and response prevention in obsessive-compulsive disorder: effects of habituation and expectancy violation on short-term outcome in cognitive behavioral therapyMean symptom change on the Y-BOCS self-rating from the time of the first therapy session (t1) across the time immediately before the first ERP (tERP) to the time after 20 sessions (t20). Error bars indicate standard errors. Note. n(t1) = 105, n(tERP) = 106, n(t20) = 105Back to article page