Fig. 6: Dizogotic twin OCS resemblance.
From: The genetic epidemiology of obsessive-compulsive disorder: a systematic review and meta-analysis

OCS cooccurence rate between dizigotic twin pairs was about 23%.
From: The genetic epidemiology of obsessive-compulsive disorder: a systematic review and meta-analysis
OCS cooccurence rate between dizigotic twin pairs was about 23%.