Table 2.

Factor Loadings of Patient Portal Features on Each Feature Domain

	Feature Domain^a
Feature	Messaging	Health Info Management	Billing/Insurance	Resource/Education
Messaging - view	0.789	0.373	0.096	0.021
Messaging - write	0.851	0.302	0.059	0.007
Messaging - view medical	0.833	0.139	0.073	0.142
Messaging - write medical	0.879	0.224	0.088	-0.034
Appointment access	0.197	0.740	0.164	0.253
Appointment scheduling	0.188	0.574	0.146	0.092
Record access	0.269	0.688	0.075	0.045
Record management	0.105	0.510	0.078	−0.366
Visit Summary	0.188	0.783	0.103	0.118
Insurance and payment - View	0.102	0.349	0.675	0.035
Insurance and payment - Write	0.083	0.001	0.893	−0.007
Documentation	0.196	0.472	-0.005	0.501
Resource	0.104	0.142	0.036	0.889
Sums of squares (eigenvalue)	4.88	1.42	1.06	1.01
Percent of trace	37.5	10.9	8.2	7.8

↵a Numbers are rotated factor loadings which are correlations between feature types and feature domains.
Factor loadings are marked bold for features assigned to a corresponding domain.