Table 2.

Estimated Risk Ratios of Being Adherent (PDC≥80%) to Medications in Therapeutic Category.

	ACEI/ARB (n=83,044)	ORAL DM (n=54,488)	STATINS (n=90,020)
Age (ref: 65-69)
70-74	0.99	1.00	1.01
75-79	0.99*	0.98**	1.01
80-84	0.97***	0.97***	1.01
85+	0.97***	0.95***	1.00
Female	1.00	0.98***	0.96***
Race/Ethnicity (ref: White)
Hispanic	0.97***	0.98**	0.95***
American Indian/Alaska Native	0.99	0.96	0.95
Asian	1.00	1.01*	1.00
Native Hawaiian/Pacific Islander	0.92**	0.98	0.93*
Black	0.96***	0.93***	0.91***
Missing Race	1.02***	1.02**	1.01
Census Block Group Median Household Income (ref: <$30,000)
$30,000-$49,999	1.00	1.00	1.01
$50,000-$69,999	1.00	1.00	1.01
$70,000-$89,999	1.00	1.01	1.02*
$90,000+	1.00	1.00	1.02*
Census Block Group Percentage of Adults with a Bachelor's Degree or Higher Degree (ref: <15%)
15-24%	1.00	1.00	1.00
25-49%	1.01	1.01	1.01
50%+	1.00	1.00	1.00
Number of Medications at Study Start	1.01***	1.02***	1.02***
Mean Days Supply of Drugs in Therapeutic Category in 2010 (ref: <31)
31-60	1.12***	1.23***	1.11***
61-90	1.35***	1.48***	1.47***
>90	1.61***	1.61***	1.61***
Percentage of Drugs in Therapeutic Category Refilled Via Mail Order Pharmacy in 2010 (ref: 0%)
1%-50%	1.01	1.01	1.01
51%-100%	1.07***	1.06***	1.07***
Generic Drug Co-Payment for 30 Day Supply in 2010 (ref: >$10)
$0-$10	1.02**	1.02**	1.02**
Annual Individual Out-of-Pocket Maximum in January 2010 (ref: >$2,000)
$0-$2,000	1.02***	1.01**	1.02***
Interaction of: Percentage Refilled via Mail Order Pharmacy × Race
51%-100% × Black	1.02	1.05*	1.05**
51%-100% × Hispanic	1.03**	1.01	1.04**

^*Statistically significant at p<0.05

^**p<0.01

^***p<0.001

Notes: (1) Models adjusted for HMO site and whether patient was enrolled in health plan for all 12 months of 2010; (2) 3,076, 2,141, and 3,256 observations with missing values for census block group variables and generic drug co-payment excluded from ACEI/ARB, ORAL DM, and STATINS regressions, respectively.