Network outcome analysis identifies difficulty initiating sleep as a primary target for prevention of depression: a 6-year prospective study.

Participants who developed MDD during the 6 year follow-up period were slightly, but nonsignificantly, younger (39.1 versus 41.5 years, p = .09) and were more likely to be female (marginally significant; 70.2% versus 61.0% female, p = .05), as compared with participants who did not develop MDD.

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