This study aimed to investigate whether (1) depression is associated with cognitive decline in Korean older adults and (2) the relationship between depression and cognitive function varies by gender. Using Korean Longitudinal Study of Aging data of 2006 to 2014, we studied 1787 adults aged 65 years or older who had normal cognitive function at baseline. This study examined the effects of depression on cognitive decline by using an interaction term of baseline depression and time, and compared relationships by gender. Among male participants, K-MMSE (Korean-Mini-Mental Status Examination) scores decreased with age, at an annual rate of approximately 0.465 points. Baseline depression was found to accelerate the decline in cognitive function, by approximately 0.184 points per year. Among female participants, K-MMSE scores decreased with age, at an annual rate of approximately 0.585 points. Baseline depression was not related to the decline in cognitive function. These results suggest the need for community-based programs to increase awareness of mental health problems need to be developed to encourage the use of health services to prevent or delay cognitive decline in older Korean males.
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