Article
Age at onset and familial risk for major depression in a Swedish national twin sample.
Psychological medicine - 1 Nov 2005
Kendler Kenneth S, Gatz Margaret, Gardner Charles O, Pedersen Nancy L
Abstract excerpt
BACKGROUND: In many biomedical disorders, early age at onset (AAO) is an index of high liability to illness which is manifest by an increased risk of illness in relatives. Most but not all prior studies report such a pattern for major depression (MD). METHOD: Lifetime MD and AAO were assessed at personal interview using modified DSM-III-R criteria in 13864 twin pairs, including 4229 onsets of MD, from the Swedish...
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