Transportation barriers to health care and mortality risk among the U.S. adults with history of cancer.

Abstract

121 Background: Lack of transportation delayed medical care for approximately 6 million Americans in 2017. Prior studies showed cancer survivors tend to have more healthcare service use, higher medical cost, and adverse clinical outcomes. It is important to understand the prevalence of, risk factors for, and long-term health consequences of transportation barrier to health care among cancer survivors. Methods: We identified cohorts of adult with history of cancer (n = 25,317) and adults without history of cancer (n = 422,797) from the 2000-2014 National Health Interview Survey (NHIS). Transportation barriers were measured as medical care delay due to lack of transportation in the past 12 months using a survey question. The prevalence of transportation barriers was estimated using multivariable logistic models. Risk of mortality estimated with weighted Cox’s proportional hazards models with age as the time scale, adjusting for sex, race/ethnicity, educational attainment, marital status, region, comorbidities, and survey year. All analyses accounted for complex survey design using SAS statistical software, version 9.4 (SAS Institute Inc.), and SAS callable SUDAAN 11.0.3. Results: After adjustment for sociodemographic factors and comorbidities, the prevalence of transportation barrier were significantly higher among cancer survivors than among respondents without cancer history (2.1% vs 1.6%, p = 0.001, adjusted odd ratio [OR], 1.22; 95% confidence interval (95CI): 1.10-1.35). Cancer survivors with transportation barrier were more likely to be younger, female, Hispanic or Asian/Pacific Islander, less educated, unmarried, public insurance beneficiary or uninsured, and with more comorbidities. Among all participants, cancer survivors with transportation barrier had the highest adjusted mortality risk (hazard ratio [HR]: 2.12, 95CI: 1.81-2.49); followed by cancer survivors without transportation barrier (HR: 1.53, 95CI: 1.42-1.65); and adults without a cancer history with transportation barrier (HR: 1.50; 95CI: 1.45-1.55) compared with adults with neither a cancer history nor transportation barrier. Conclusions: Transportation barriers to health care had a disproportionate impact on cancer survivors, especially those who are underserved, and who have more medical needs. Increased risk of mortality was observed among adults with and without a cancer history who delayed care due to lack of transportation. It highlights the need for efforts to mitigate transportation barriers to medical care during a time of rapid change in transportation and telehealth technology.