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Sleep Disturbance as a Catalyst in the Cyclical Link Between Depressive Symptoms and Disability in Instrumental Activities of Daily Living in Older Chinese Adults: Longitudinal Cohort Study
Sleep Problems May Worsen the Cycle Between Depression and Daily Task Difficulties in Older Chinese Adults
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Abstract
Prior depression significantly predicted subsequent disability in instrumental activities of daily living (IADLs) at T2 (β=0.070, P<.001) and T3 (β=0.074, P<.001).
- Disability in IADLs at T1 predicted subsequent depression at T2 (β=0.094, P<.001) and T3 (β=0.100, P<.001).
- Sleep disturbances were identified as a mediating factor in the relationship between prior disability in IADLs and subsequent depression (β=0.062, SE=0.010, P<.001).
- The mediation effect of sleep disturbances accounted for 50.41% of the total effect of prior disability on later depression.
- The direct effect of prior depression on subsequent disability in IADLs was not significant after accounting for sleep disturbances (β=0.009, SE=0.018, P=.61).
- Findings suggest a complex, bidirectional relationship between depressive symptoms and disability in IADLs among older Chinese adults.
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