Article
Heritability of tic disorders: a twin-family study.
Psychological medicine - 1 Apr 2017
Zilhão N R, Olthof M C, Smit D J A, Cath D C, Ligthart L, Mathews C A, Delucchi K, Boomsma D I, Dolan C V
Abstract excerpt
BACKGROUND: Genetic-epidemiological studies that estimate the contributions of genetic factors to variation in tic symptoms are scarce. We estimated the extent to which genetic and environmental influences contribute to tics, employing various phenotypic definitions ranging between mild and severe symptomatology, in a large population-based adult twin-family sample. METHOD: In an extended twin-family design, we...
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