EXHIBIT 4. Estimated Growth In Secure Messaging Within Primary Care Physician Panels, 2001–10.

Source/Notes: SOURCE Authors’ analysis of PatientSite data and Beth Israel Deaconess Medical Center scheduling data.

NOTES Each dot represents the median for physicians’ panels. Whisker marks denote the twenty-fifth and seventy-fifth percentiles. The denominator is the number of unique patients seen by each physician.