Background Several initiatives have focused on increasing colorectal cancer (CRC) screening rates, but national rates still fall below 70% for many groups, particularly those in underserved communities. Examining CRC screening determinants in groups who have completed screening for other cancer sites may provide useful information to support future initiatives. In 2015, 71.6% of women nationally completed mammograms in the past two years, while only 63% completed any CRC screening procedures. Purpose We examined data from the 2015 National Health Interview Survey to identify determinants of CRC screening completion among women adherent to breast cancer (BrCa) screening guidelines. We hypothesized that race, income, and psychosocial factors would explain CRC screening non-adherence. Methods The sample contained women (N=1206), aged 50-74 years, BrCa free, who completed a mammogram in the past two years, and were of average CRC risk (no first degree relative with cancer, history of polyps or inflammatory bowel disease). Bivariate associations between sociodemographic, health access, perceived BrCa risk, perceived CRC risk variables, and CRC screening status were examined using chi-square tests. Multivariate logistic regression analysis was used to examine factors associated with CRC screening completion. Results Prevalence of CRC screening in this sample was 55.52% including: Sigmoidoscopy (1.47%), colonoscopy (50.33%), fecal occult blood test (10.81%). Significant differences in CRC screening (p <.01) by education, income, insurance, foreign birth status, and language regularly spoken were revealed. Having insurance (OR:4.52, CI:2.20-9.31) and being foreign-born (OR: 1.77, CI:1.17-2.66) were independently associated with CRC screening completion after controlling for all other factors. Conclusion CRC screening rates among women completing breast cancer screening were lower than the national average for women. Neither perceived BrCa risk nor perceived CRC risk explained CRC screening behavior. Income and health insurance variables appear to drive sociodemographic differences in screening completion. However, foreign-born status had a direct impact on CRC screening behavior. Differences in the availability of free or low-cost screening programs for BrCa and CRC may explain these findings. More research is needed to understand how sociodemographic factors interact to impact CRC screening rates in this group.

Citation Format: Deeonna E Farr, Leslie E Cofie, Alison T Brenner, Ronny A Bell, Daniel S Reuland. Sociodemographic determinants of colorectal cancer screening completion among women adherent to mammography screening guidelines [abstract]. In: Proceedings of the Twelfth AACR Conference on the Science of Cancer Health Disparities in Racial/Ethnic Minorities and the Medically Underserved; 2019 Sep 20-23; San Francisco, CA. Philadelphia (PA): AACR; Cancer Epidemiol Biomarkers Prev 2020;29(6 Suppl_2):Abstract nr C108.