Depressive symptoms are associated with mortality among patients with hip fractures in Japan: a prospective cohort study.

In the stratified analysis, the results showed a trend of increasing mortality rates as the PHQ-9 score increased, with the highest mortality observed in the moderately severe group.

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While depressive symptoms remained an independent predictor of mortality, the interaction terms did not reach statistical significance, suggesting that the effect of depressive symptoms on mortality was not significantly modified by these variables.

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