Living alone and cancer mortality by race/ethnicity and socioeconomic status among US working‐age adults.

Background: Previous studies have shown an association between living alone and cancer mortality; however, findings by sex and race/ethnicity have generally been inconsistent, and data by socioeconomic status are sparse. The association between living alone and cancer mortality by sex, race/ethnicity, and socioeconomic status in a nationally representative US cohort was examined. Methods: Pooled 1998–2019 data for adults aged 18–64 years at enrollment from the National Health Interview Survey linked to the National Death Index (N = 473,648) with up to 22 years of follow‐up were used to calculate hazard ratios (HRs) for the association between living alone and cancer mortality. Results: Compared to adults living with others, adults living alone were at a higher risk of cancer death in the age‐adjusted model (HR, 1.32; 95% CI, 1.25–1.39) and after additional adjustments for multiple sociodemographic characteristics and cancer risk factors (HR, 1.10; 95% CI, 1.04–1.16). Age‐adjusted models stratified by sex, poverty level, and educational attainment showed similar associations between living alone and cancer mortality, but the association was stronger among non‐Hispanic White adults (HR, 1.33; 95% CI, 1.25–1.42) than non‐Hispanic Black adults (HR, 1.18; 95% CI, 1.05–1.32; p value for difference <.05) and did not exist in other racial/ethnic groups. These associations were attenuated but persisted in fully adjusted models among men (HR, 1.13; 95% CI, 1.05–1.23), women (HR, 1.09; 95% CI, 1.01–1.18), non‐Hispanic White adults (HR, 1.13; 95% CI, 1.05–1.20), and adults with a college degree (HR, 1.22; 95% CI, 1.07–1.39). Conclusions: In this nationally representative study in the United States, adults living alone were at a higher risk of cancer death in several sociodemographic groups. In a nationally representative study with up to 22 years of mortality follow‐up, US working‐age adults experiencing social isolation, measured as living alone, were at a higher risk of cancer death than adults living with others. This association persisted among non‐Hispanic White adults and adults with higher education even after accounting for differences in a wide range of sociodemographic, behavioral, and health characteristics. [ABSTRACT FROM AUTHOR]