Major Depression .... In the Kendler study 416 identical and 264 fraternal female twin pairs located through a state twin registry in Virginia were studied for symptoms of depression .... (2680 11 )
The Human Body .... Overall, findings from the Minnesota Twin Registry research constitute a powerful rebuttal of those who maintain that environmental influences are the primary .... (1704 7 )
Attention-deficit hyperactivity disorder .... another study of 2,600 women and girls who were part of a registry of twins .... These twin studies provide strong evidence for a genetic factor in the cause of ADHD .... (3113 12 )
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