Background and objectives: Disparities in health care outcomes and resources utilized are present in the treatment of many conditions and represent an area for targeted improvement. This study analyzes the differences in outcomes and total hospital charges between the highest and lowest income quartiles of patients undergoing sigmoid colectomy.
Methods: This retrospective cohort study included patients undergoing sigmoid colectomy from 2013 to 2014 queried from the Agency for Healthcare Research and Quality National Inpatient Sample Database who were categorized as the lowest and highest income quartile based on average income of the patient's ZIP code. Patients were grouped into income quartiles, as defined by average income in the ZIP code of residence. In-hospital complications were the primary outcome of this study. We hypothesized that patients in the lowest income quartile would have poorer outcomes than those in the highest income quartile prior to data collection.
Results: The lowest (n = 40,995) and highest (n = 40,940) income quartiles are not significantly different based on age or gender. The lowest income quartile was sicker, with higher mean scores for the All Patient Refined Diagnosis Related Group Severity Index and All Patient Refined Diagnosis Related Group Risk of Mortality Index. The lowest income quartile cohort had higher rates of postoperative complications and higher total charges than those in the highest income quartile. Adjusted regression analysis showed significantly lower total charges for the lowest income quartile but no significant differences in overall complications, mortality rates, or nonhome discharge.
Conclusions: Patients in the highest income quartile utilize more hospital resources than the lowest income quartile. Additional study is required to understand why these differences exist.
Key points: 1. Significant differences in outcomes and hospital charges exist between socioeconomic groups undergoing sigmoidectomy. 2. There does not seem to be a difference in outcomes after sigmoidectomy among different socioeconomic groups. 3. Elective and laparoscopic sigmoid colectomy is more frequently applied to higher socioeconomic groups. 4. Hospital charges are also greater among patients of higher socioeconomic groups undergoing sigmoid colectomy.
Question: Does socioeconomic status affect outcomes and total charges in patients undergoing sigmoid colectomy?
Findings: Unadjusted analysis showed significant disparities between the highest and lowest income quartile in outcomes after sigmoid colon resection. Adjusted analysis showed no difference in outcomes, with patients in the highest income quartile having higher total charges.
Meaning: There is a value difference between high-income and low-income patients undergoing sigmoid colectomy.
Keywords: Disparities; Hospital charges; Patient income; Sigmoidectomy; Socioeconomic status.