<b>Objective: </b>To examine whether neighborhood
socioeconomic status (SES) is a predictor of non-drug-related health
care costs among Canadian adults with diabetes, and if so, whether SES
disparities in costs are reduced after age 65, when universal drug coverage
commences as an insurable benefit.
<p><b>Methods: </b>Administrative health
databases were used to examine publicly-funded health care expenditures among
698,113 younger (20-64 years) and older adults (≥65 years) with diabetes in
Ontario from April 2004 to March 2014. Generalized linear models were constructed
to examine relative and absolute differences
in health
care costs (total and non-drug-related) across neighborhood socioeconomic
status (SES) quintiles, by age, adjusting
for differences in age,
sex, diabetes duration, and comorbidity. </p>
<p><b>Results:</b> Unadjusted costs per
person-year in the lowest (Q1) versus highest (Q5) SES quintile were 39% higher
among younger adults ($5,954 vs. $4,270 Canadian dollars), but only 9% higher
among older adults ($10,917 vs. $9,993). Adjusted non-drug costs (primarily for
hospitalizations and physician visits) were $1,569 per person-year higher among younger adults in Q1 vs. Q5
(modeled relative cost difference: +35.7%) and $139.3 million per year among
all individuals in Q1. Scenarios in which these excess costs per person-year
were decreased by ≥10% or matched the relative difference among seniors suggested
a potential for savings in the range of $26.0 to $128.2 million per year among
all lower SES adults under age 65 (Q1-4). </p>
<p><b>Conclusions: </b>Socioeconomic status is a predictor of diabetes-related health
care costs in our setting, more so among adults under age 65, a group that lacks
universal drug coverage under Ontario’s health care system. Non-drug related
health care costs were more than one-third higher in younger, low SES adults,
translating to >$1 billion more in health care expenditures over 10 years.</p>