Association of Neighborhood Deprivation, Race, and Postoperative Outcomes
Authors: Diaz Adrian , Valbuena Valeria S.M. , Dimick Justin B. , Ibrahim Andrew M. 
Published: July 2022

Introduction:
While there is a broad understanding that patient factors, hospital characteristics, and an individual’s neighborhoods all contribute to the observed disparities, the relationship between these factors remains unclear. The purpose of this study was to evaluate the association of neighborhood deprivation improve postoperative outcomes for White and Black Medicare beneficiaries equally.

Methods:
We performed a cross-sectional Retrospective cohort study from 2014 to 2018 of 1372,487 White and Black Medicare beneficiaries aged 65 and older who underwent an inpatient colon resection, coronary artery bypass, cholecystectomy, appendectomy, or incisional hernia repair. We compared postoperative complications, readmission, and mortality by race across neighborhood deprivation. Outcomes were risk-adjusted using a multivariable logistical regression model accounting for patient factors (age, sex, Elixhauser comorbidities), admission type (elective, urgent, emergency), type of operation, and each neighborhoods Area Deprivation Index; a modern-day measure of neighborhood disadvantage that includes education, employment, housing quality, and poverty measures.

Results:
Overall, 1372,487 Medicare beneficiaries with mean age 72.1 years, 50.3% female, 91.2% White, residing in 1107,051 unique neighborhoods underwent 1 of 5 operations. The proportion of Black beneficiaries was 6.5% within the lowest deprivation neighborhoods and increased to 16.9% within the highest deprivation neighborhoods (P<0.001). The interaction between beneficiary neighborhood and race demonstrated that the association of neighborhood on outcomes varied by race. Specifically, White beneficiaries had 1.5% absolute mortality decrease from the highest to lowest deprivation neighborhoods [odds ratio (OR):1.32, 95% confidence interval (CI): 1.27–1.38; P<0.001], whereas Black beneficiaries had a 0.72% absolute mortality decrease from the highest to lowest deprivation neighborhoods (OR: 1.13, 95% CI: 1.02–1.24; P=0.018). Similarly, White beneficiaries had 3.6% absolute decrease in complication rate from the highest to lowest deprivation neighborhoods (OR: 1.23, 95% CI: 1.21–1.28; P<0.001) while Black beneficiaries had a 1.2%% absolute decrease in complication rate from the highest to lowest deprivation neighborhoods (OR: 1.07, 95% CI: 1.01–1.13; P=0.017). For 30-day readmission rates, White beneficiaries realized a 2.3% absolute decrease from the highest to lowest deprivation neighborhoods (OR: 1.19, 95% CI: 1.02–1.24; P<0.001), whereas Black beneficiaries saw no change (OR: 1.03, 95% CI: 0.97–1.10; P=0.269).

Conclusions and Relevance:
Lower neighborhood deprivation is associated with improved outcomes across both White and Black Medicare beneficiaries; however, improvement in neighborhood deprivation disproportionately favored White beneficiaries. These findings provide a cautionary example of the misperception of the protective effect of higher social class for Black patients and provide a cautionary example that improvements in neighborhoods may have disparate health impact on its members.