Figure. Weekly Volume of e-Visits, Patient Message Threads, and Patient Messages.

Messages refer to patient medical advice request messages; threads are defined as a distinct conversation inclusive of all back-and-forth responses. All regression lines are a result of single-arm interrupted time-series models with Newey-West standard errors. The blue dotted line in each panel indicates November 14, 2021, which was the switchover to clinician-initiated e-visit billing.