A Pilot Analysis of Patient Portal Use and Breast Cancer Screening Among Black Patients in a Large Academic Health System.

Introduction: Patient portals may facilitate breast cancer screening and could be an important factor to address inequities; however, this association is not well characterized. The authors sought to examine this association in a large academic health system to inform interventions to address breast cancer screening inequities. Methods: The authors conducted a cross-sectional study among Black patients in a large academic health system using logistic regression to examine the association between breast cancer screening and portal use, adjusting for multilevel covariates and interactions. The authors estimated average marginal effects to examine the additive probability of breast cancer screening completion given portal use in the prior 12 months. Results: In the unadjusted model, portal use was associated with an estimated mean 24.8 percentage points (95% CI=20.7, 29.0) increased likelihood of completing breast cancer screening. In the adjusted model, portal use was associated with an estimated mean 16.2 percentage points (95% CI=11.2, 21.3) increased likelihood for completing breast cancer screening. Conclusions: Improving portal access and use among racialized groups who face both portal and breast cancer screening inequities could be one strategy to address inequities. These pilot data will inform subsequent community-engaged research to better understand this association and develop and test a portal intervention to facilitate breast cancer screening access among Black patients eligible for screening.