According to a recent assessment of a proactive implementation strategy for an interactive patient portal in 8 primary care practices:

• 25.6% of the patients used the patient portal
• The rate of patient use increased 1.0% per month over 31 months
• 23.5% of patients signed up for patient portal use within 1 day of their office visit

Source: "Engaging Primary Care Patients to Use a Patient-Centered Personal Health Record," Annals of Family Medicine, abstract only, September/October 2014, http://annfammed.org/content/12/5/418.abstract