Purpose
To understand the effect of socioeconomic status (SES) on the risk of complications in type 1 diabetes (T1D), we explored the relationship between SES and major diabetes complications in a prospective, observational T1D cohort study.
Methods
Complete data were available for 317 T1D persons within 4 years of age 28 (ages 24–32) in the Pittsburgh Epidemiology of Diabetes Complications Study. Age 28 was selected to maximize income, education, and occupation potential, and minimize the effect of advanced diabetes complications on SES.
Results
The incidences over 1–20 years follow-up of end-stage renal disease (ESRD) and coronary artery disease (CAD) were 2–3 times higher for T1D individuals without, compared to those with a college degree (p<0.05 for both), while autonomic neuropathy (AN) incidence was significantly higher for low income and/or non-professional participants (p<0.05 for both). HbA1c was inversely associated only with income level. In sex- and diabetes duration-adjusted Cox models, lower education predicted ESRD (HR=2.9, 95% CI, 1.1–7.7) and CAD (HR=2.5, 1.3–4.9), whereas lower income predicted AN (HR=1.7, 1.0–2.9) and lower extremity arterial disease (HR=3.7, 1.1–11.9).
Conclusions
These associations, partially mediated by clinical risk factors, suggest that lower SES T1D individuals may have poorer self-management and, thus, more diabetes complications.