Table II.

Portal activity by patient among patients who ever used the portal by intervention group: Portal only (PT) versus Home Visit in addition to portal training (HV + PT).

	Home Visit and Portal Training (HV+ PT)	Portal Training Only	All Patients
	N=87	N=83	N=170
Portal use by activity category among portal users	n (% of portal users)
Read Message	75(86%)	69(83%)	144(85%)
Write Secure Message	30(34%)	24(29%)	54(32%)
Review lab result	76(87%)	63(76%)	139(82%)
Review appointment date/location	78(90%)	63(76%)	141(83%)
Schedule appointment	32(37%)	19(23%)	51(30%)
Review medication list	52(60%)	47(57%)	99(58%)
Review immunization record	48(55%)	40(48%)	88(48%)
Request medication renewal	52(60%)	41(49%)	93(55%)
Review visit information	49(56%)	44(53%)	93(55%)

Note: This table includes only patients who used the patient portal independently of any assistance from the study staff or home visitors. We exclude all portal usage on days during which there was staff contact with the patient. Portal usage was first identified by an episode of use – defined by a login and logoff or a lapse of time between keystroke. Then, we categorized patient portal usage at the patient keystroke level within episode and counted activity type per episode. Finally, we calculated the number of patients who had ever used the Portal for the key activities (See Appendix) for the definition of key activities in any portal usage episode between the time of randomization and the time of the last data collection. See technical appendix (Appendix) for details in methods for Portal data.