Fig. 5: Monozigotic twin OCS resemblance.
From: The genetic epidemiology of obsessive-compulsive disorder: a systematic review and meta-analysis

OCS coccurrence rate in monozigotic twin pairs was about 47%.
From: The genetic epidemiology of obsessive-compulsive disorder: a systematic review and meta-analysis
OCS coccurrence rate in monozigotic twin pairs was about 47%.