A comparative retrospective longitudinal study of arthritis risk and cognitive decline in older adults.

Arthritis often results in unmet healthcare needs for older adults with cognitive decline, who may struggle to communicate pain or recall symptoms. However, the risk factors for arthritis in this group remain underexplored. We addressed this gap by identifying and comparing arthritis risk factors among older adults with varying cognitive statuses. Data from 334 participants with cognitive decline and 808 participants with normal cognition were analysed using the Korean Longitudinal Study of Aging, tracking arthritis diagnoses over 12 years with Kaplan-Meier curves and Cox proportional hazards regression. Results showed 47.6% of older adults with cognitive decline developed arthritis, compared with 30.1% with normal cognition. Key risk factors for the cognitive decline group included depressive symptoms (hazard ratio [HR]: 1.87), living alone (HR: 1.66), infrequent social interactions (HR: 1.42), and greater dependency in daily activities (HR: 1.41). In the normal cognition group, additional chronic illnesses (HR: 1.41) and higher body mass index (HR: 1.09) were significant risk factors. Understanding these distinct risk factors is crucial for preventing and managing arthritis among at risk groups. Moreover, these findings can assist in developing comprehensive public health strategies integrating mental health and social support to improve health outcomes for older adults with cognitive decline.