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Association between Changes in Depressive State and Cognitive Function.

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Cognitive impairment is linked to changes in depressive status among Korean older adults. Both persistent and new-onset depression negatively impact cognitive function, with depression-onset showing greater impairment.

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Area of Science:

  • Gerontology
  • Neuroscience
  • Psychiatry

Background:

  • Depression and cognitive impairment share a complex relationship.
  • Limited research exists on how changes in depressive status affect cognitive function over time.

Purpose of the Study:

  • To investigate the association between changes in depressive status and cognitive function in Korean elderly individuals.
  • To analyze cognitive function trajectories based on transitions in depression.

Main Methods:

  • Utilized the Korean Longitudinal Study of Aging (KLoSA) database.
  • Measured cognitive function using Mini-Mental State Examination (MMSE) scores.
  • Assessed depression levels with the Center for Epidemiologic Studies Depression Scale (CESD-10).
  • Categorized participants into four groups based on depressive status changes: normal-to-normal, normal-to-depressive, depressive-to-normal, and depressive-to-depressive.
  • Employed analysis of variance, multiple regression, and subgroup analyses for statistical examination.

Main Results:

  • Multiple regression analysis revealed significant negative associations between cognitive function (MMSE) and changes in depressive status (Groups B, C, D) compared to the normal-to-normal group (Group A).
  • The magnitude of cognitive impairment was greatest in the depressive-to-depressive group (Group D), followed by normal-to-depressive (Group B) and depressive-to-normal (Group C).
  • Subgroup analyses indicated that age, employment status, social participation, physical activity, and chronic medical conditions significantly influenced cognitive decline related to depressive status changes.

Conclusions:

  • Both current and past depression are associated with cognitive impairment in older adults.
  • Cognitive function impairment is more pronounced in individuals who develop depression (depression-onset) compared to those who recover from it (depression-remission).
  • Factors such as age, engagement in stimulating activities, and the presence of chronic conditions are critical correlates of cognitive decline in the context of changing depressive states.