Disparities in Acute and Chronic Complications of Diabetes Along the U.S. Rural-Urban Continuum

Abstract

OBJECTIVE To determine the relative hazards of acute and chronic diabetes complications among people with diabetes across the U.S. rural-urban continuum. RESEARCH DESIGN AND METHODS This retrospective cohort study used the OptumLabs Data Warehouse, a deidentified data set of U.S. commercial and Medicare Advantage beneficiaries, to follow 2,901,563 adults (age ≥18 years) with diabetes between 1 January 2012 and 31 December 2021. We compared adjusted hazard ratios (HRs) of diabetes complications in remote areas (population <2,500), small towns (population 2,500–50,000), and cities (population >50,000). RESULTS Compared with residents of cities, residents of remote areas had greater hazards of myocardial infarction (HR 1.06 [95% CI 1.02–1.10]) and revascularization (HR 1.04 [1.02–1.06]) but lower hazards of hyperglycemia (HR 0.90 [0.83–0.98]) and stroke (HR 0.91 [0.88–0.95]). Compared with cities, residents of small towns had greater hazards of hyperglycemia (HR 1.06 [1.02–1.10]), hypoglycemia (HR 1.15 [1.12–1.18]), end-stage kidney disease (HR 1.04 [1.03–1.06]), myocardial infarction (HR 1.10 [1.08–1.12]), heart failure (HR 1.05 [1.03–1.06]), amputation (HR 1.05 [1.02–1.09]), other lower-extremity complications (HR 1.02 [1.01–1.03]), and revascularization (HR 1.05 [1.04–1.06]) but a smaller hazard of stroke (HR 0.95 [0.94–0.97]). Compared with small towns, residents of remote areas had lower hazards of hyperglycemia (HR 0.85 [0.78–0.93]), hypoglycemia (HR 0.92 [0.87–0.97]), and heart failure (HR 0.94 [0.91–0.97]). Hazards of retinopathy and atrial fibrillation/flutter did not vary geographically. CONCLUSIONS Adults in small towns are disproportionately impacted by complications of diabetes. Future studies should probe for the reasons underlying these disparities.