Table 1.

Baseline Sample Characteristics by KP.org Refill Function Use

Mean (s.d.) or column %	Total	KP.org refill function user groups
		Reference group	Exposure groups
	n=17,760	No use (n=9,055)	Occasional use (n=5,418)	Exclusive use (n=3,287)	P-value
Age (s.d.)	62.7 (11.3)	64.6 (11.0)	60.1 (11.3)	61.9 (10.8)	<0.001
Female	46	46	48	43	<0.001
Race					<0.001
African American	7	8	8	5
Asian	10	10	10	11
Caucasian	58	58	56	62
Filipino	6	7	6	6
Latino	9	9	10	8
Mixed/other/unknown	9	9	10	9
Upper quartile of Charlson co-morbidity scale	28	30	25	26	<0.001
Use of other kp.org features
Secure messaging	78	71	85	86	<0.001
Appointments	54	37	70	72	<0.001
Lab view	86	79	93	94	<0.001
Number of Chronically Used Medications	6.7 (3.1)	6.6 (3.1)	6.7 (3.1)	6.8 (3.0)	0.02
Number of Outpatient visits	11.4 (12.2)	11.5 (12.0)	11.5 (13.1)	10.9 (11.2)	0.08
Proportion Adherent to Statin Medications Pre-baseline (CMG < 20%)	78	81	74	78	<0.001
LDL<100 mg/dL	84	84	82	87	<0.001
DISTANCE respondents	12	12	12	13	0.08

DISTANCE subsample	n=2178	No use (n=1,072)	Occasional use (n=668)	Exclusive use (n=438)	P-value
Education (n=2,148)
No degree	8	8	7	10	0.36
High school	24	23	26	25
Some college	25	25	26	23
College graduate or more	43	45	41	42
Married (n=2,126)	76	73	80	78	0.003
Limited English proficiency (n=1,919)	3	4	3	4	0.78
Inadequate health literacy (n=1,633)	59	61	54	63	0.01

Note: Missing survey data among DISTANCE subsample: N for education=2,148; N for marital status=2,126; N for language=1,919; N for health literacy=1,633