Why spouses depress each other: A cross-national study to test the shared resource hypothesis in depressive symptom concordance within older adult couples.

The shared resource hypothesis suggests that married couples share the same environmental resources, which shape their health concordance. This study tests its cross-national applicability. Cross-sectional 2012-2013 Health and Retirement Study data from China, England, Mexico, and the United States were analyzed. Heterosexual couples (age ≥60) who were married or partnered were studied (N = 20,565 pairs). Dyadic data were analyzed by multilevel models to examine the effect of self and spousal social and physical health statuses on depressive symptoms. Regression models were used to test the relationship between couples' shared resources and depressive symptom concordance. Results indicated both husbands and wives' depressive symptoms were associated with their own and spouses' social and health statuses. Most couple-level resources were insignificant predictors for Chinese and Mexican couples' concordance, but having more social and financial resources was associated with higher concordance among British and American couples. Self-reported health was the most consistent predictor in all countries. The shared resource hypothesis was more applicable to depressive symptom concordance within couples in the United States and England, but not in China and Mexico. Couple-centered intervention is suggested for clinical practice, and the spousal effect should be considered in policymaking.