<i>Is Anybody Out There?</i> Understanding the Reach of Lung Cancer Screening Health Communication Through EHR Patient Portal

= 820) using multivariate log binomial regression to calculate prevalence ratios (PRs) and confidence intervals (CIs). Most participants (89.6%) had access to the portal. No access was associated with current tobacco use (PR 0.4), neighborhood income <$50K (PR 0.3), and <5 years of insurance (PR 0.5). Among the intervention group, 81.2% opened the message. Not opening was associated with older age (PR 0.7), current tobacco use (PR 0.5), >1 well-care visit in the past year (PR 0.6), and 5-10 years of insurance (PR 0.5). While patient portals can broadly deliver LCS interventions, disparities in access and engagement suggest the need for alternative communication strategies.