Nature, nurture and depression: a twin study.


We studied a series of twins systematically ascertained through 214 probands (84 monozygotic, 130 dizygotic) who had had one or more episodes of hospital-treated major depression. A variety of definitions of depression were applied to the co-twins all of which resulted in (a) markedly higher rates of disorder than are found in the general population, (b… (More)


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