Living Arrangement Modifies the Associations of Loneliness with Adverse Health Outcomes in Older Adults: Evidence From the CLHLS
Abstract Background: Although it has been suggested that loneliness is a risk factor for adverse health outcomes, living arrangement may confound the association. This study aimed to investigate whether the associations of loneliness with adverse health outcomes differ in community-dwelling older adults according to different living arrangements.Methods: In the 2008/2009 wave of Chinese Longitudinal Healthy Longevity Survey, 16255 community-dwelling older adults (≥65 years) were recruited. Living arrangements and feelings of loneliness were assessed. Health outcomes including cognitive and physical functions were assessed using MMSE, ADL/IADL scales and Frailty Index in the 2008/2009 and 2011/2012 waves; mortality was assessed in the 3-year follow-up from 2008/2009 to 2011/2012. The associations of loneliness with adverse health outcomes accroding to different living arrangements were estimated using logistic regression or Cox proportional hazards regression models. Interactions between living arrangement and loneliness on adverse health outcomes were also investigated.Results: Older adults who were lonely (47.8% of those living alone and 25% of those living with others) had higher prevalence of cognitive impairment, frailty and 3-year mortality than older adults without loneliness, especially among those who lived with others (OR=1.31, 95% CI=1.15-1.51; OR=1.42, 95% CI=1.26-1.60; HR=1.16, 95% CI=1.07-1.26, respecitvely). In contrast, among the living alone older adults, loneliness was only associated with higher prevalence of frailty (OR=1.41, 95% CI=1.06-1.88). Living arrangement modified the associations of loneliness with prevalent cognitive impairment and mortality (P values for interactions=0.006 and 0.015, respectively).Conclusions: Living arrangement modifies the associations of loneliness with adverse health outcomes in community-dwelling older adults, and those who lived with others but felt lonely had worse cognitive and physical functions as well as higher mortality. Special attention should be paid to this population to reduce adverse health outcomes.