Chunk #15 — RESULTS — Heritability analyses

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Familiality of Tourette syndrome, obsessive-compulsive disorder, and attention-deficit/hyperactivity disorder: heritability analysis in a large sib-pair sample.

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Heritability analyses were initially conducted for TS, OCD, OCB, and ADHD independently. TS, OCD, ADHD, and ADHD+OCD were all highly heritable in this TS-enriched sample, although OCB was not (Table 3). Adding the less severe diagnoses (CMVT and OCB) to the phenotype generally decreased rather than increased the heritability estimates (Table 3).