Purpose. Advances in virtual care technology have made healthcare more convenient and accessible. The goal of this study was to elucidate current patient portal behaviors by examining the pattern of time and service type use of patients, via data provided by access logs within electronic health records, to increase communication and care coordination through online healthcare portals. Methods. We conducted a retrospective study of patients in an academic healthcare center over a 5-year period using access log records in electronic health records (EHR). Dimensionality reduction analysis was applied to group portal functionalities into more interpretable and meaningful feature domains, followed by negative binomial regression analysis to evaluate how patient and practice characteristics affected the use of each feature domain. Results. Patient portal usage was categorized into four feature domains: messaging, health information management, billing/insurance, and resource/education. Individuals having more chronic conditions, lab tests or prescriptions generally had greater patient portal usage. However, patients who were male, elderly, in minority groups, or living in rural areas persistently had lower portal usage. Individuals on public insurance were also less likely than those on commercial insurance to use patient portals, though Medicare patients showed greater portal usage on health information management features and uninsured patients had greater usage on viewing resource/education features. Having Internet access only affected the use of messaging features, but not other feature. Conclusions. Efforts in enrolling patients in online portals does not guarantee patients using the portals to manage their health. While promoting the use of virtual health tools as part of patient-center care delivery model, primary care clinicians need to be aware of technological, socioeconomic, and cultural challenges faced by their patients
