Table. Patient Characteristics and Univariate and Multivariate Association With Patient Portal Enrollment.

Characteristic	No. (%)	HR (95% CI)
		Univariate analysis		Multivariate analysis
Total patients, No.	266 917	NA	NA	NA	NA
Age subgroups, y
18-29	32 889 (12)	1 [Reference]	NA	1 [Reference]	NA
30-39	49 037 (18)	1.29 (1.26-1.32)	<.001	1.15 (1.13-1.18)	<.001
40-49	40 699 (15)	1.03 (1.01-1.05)	<.001	0.94 (0.92-0.96)	<.001
50-59	48 676 (18)	0.94 (0.92-0.96)	<.001	0.86 (0.85-0.88)	<.001
60-69	53 108 (20)	0.96 (0.95-0.98)	<.001	0.88 (0.86-0.89)	<.001
70-79	30 524 (11)	0.85 (0.84-0.87)	<.001	0.80 (0.78-0.82)	<.001
≥80	11 984 (4)	0.63 (0.61-0.65)	<.001	0.64 (0.62-0.66)	<.001
Sex
Male	111 085 (42)	1 [Reference]	NA	1 [Reference]	NA
Female	155 718 (58)	1.08 (1.07-1.09)	<.001	1.07 (1.05-1.08)	<.001
Other	114 (<1)	0.98 (0.72-1.35)	.91	1.07 (0.78-1.47)	.68
Race/ethnicity
White	147 882 (55)	1 [Reference]	NA	1 [Reference]	NA
Asian	38 327 (14)	1.01 (0.99-1.02)	.28	1.13 (1.12-1.15)	<.001
Black	14 760 (6)	0.54 (0.53-0.56)	<.001	0.56 (0.54-0.57)	<.001
Pacific Islander	3191 (1)	0.80 (0.76-0.85)	<.001	0.84 (0.79-0.88)	<.001
Native American	1154 (<1)	0.83 (0.77-0.90)	<.001	0.84 (0.78-0.91)	<.001
Other	33 315 (12)	0.72 (0.71-0.73)	<.001	0.85 (0.83-0.86)	<.001
Unknown	28 288 (11)	0.44 (0.43-0.45)	<.001	0.47 (0.46-0.48)	<.001
Ethnicity
Other	240 804 (90)	1 [Reference]	NA	1 [Reference]	NA
Hispanic or Latinx	26 113 (10)	0.75 (0.74-0.76)	<.001	0.87 (0.85-0.89)	<.001
Relationship status
Partnership	136 942 (51)	1 [Reference]		1 [Reference]
Single	129 975 (49)	0.74 (0.73-0.75)	<.001	0.76 (0.75-0.77)	<.001
Language
English	245 013 (92)	1 [Reference]	NA	1 [Reference]	NA
Other	21 904 (8)	0.42 (0.40-0.43)	<.001	0.42 (0.41-0.43)	<.001

Abbreviations: HR, hazard ratio; NA, not applicable.