Fig. 7: Fisher Z-score between monozigotic and dizogotic twins.
From: The genetic epidemiology of obsessive-compulsive disorder: a systematic review and meta-analysis

MZ twins has considerably higher correlations for OCS than DZ twins.
From: The genetic epidemiology of obsessive-compulsive disorder: a systematic review and meta-analysis
MZ twins has considerably higher correlations for OCS than DZ twins.