The impact of internal locus of control on healthcare utilization, expenditures, and health status across older adult income levels

Our objectives were to 1) determine the prevalence of locus of control (LOC) dimensions stratified by older adult income levels; 2) characterize internal LOC attributes within income subgroups; and 3) investigate LOC associations with healthcare utilization and expenditures; self-rated health and functionality. The survey sample was identified from adults age >= 65 years with diagnosed pain conditions. Internal LOC characteristics were determined from logistic regressions; outcomes regression-adjusted. Among respondents, internal prevalence for low (N =554), medium (N= 1,394) and high income (N = 2040) was 27%, 30% and 30%, respectively. Internal was associated with high resilience, less stress, exercise and less opioid use across income levels. Lower-income internal was additionally associated with diverse social networks, physical therapy and less drug use. Those with high internal generally had lower healthcare utilization and expenditures; better self-rated health and functionality. Internal LOC is a powerful positive resource associated with better health outcomes, especially influential for lower income. (C) 2019 The Authors. Published by Elsevier Inc.