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BACKGROUND: Genetic and environmental influences on broadly-defined anorexia nervosa (AN) syndrome were examined in a population-based twin sample. METHODS: AN syndrome was assessed in 672 female 17 year-old twins using structured interviews and a self-report questionnaire. RESULTS: Twenty-six probands with AN syndrome were identified. Biometrical model-fitting analyses indicated that genetic and non-shared environmental factors accounted for 74% and 26% of the variance in AN syndrome, respectively. CONCLUSIONS: Findings support previous research indicating significant genetic and non-shared environmental influences on AN syndromes.
Klump et al. (Tue,) studied this question.