Quote:
"A strong relationship between mania and childhood physical abuse was found.
AND
These results suggest an association between early traumatic experiences and particular symptom clusters of depression, mania, or both in adults."
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http://ajp.psychiatryonline.org/cgi/...t/155/12/1746; Not the whole study but the abstract in the beginning.
They didn't actually state how strong the correlation between the two is. Since they're only suggesting an association I think it means they need to do further studies on it. But regardless I thought it was interesting.