Table 2.

Estimated Adjusted Risk Ratios (aRR) and 95% Confidence Intervals (CI) of birth cohort hepatitis C antibody testing compared with standard-of-care testing by center and patient characteristics

	Center (Intervention type)
	Center 1 (Repeated, mailings) aRR (95% CI)	Center 2 (Best Practice Alert) aRR (95% CI)	Center 3 (Patient, solicitation RR (95% CI)
Testing Group
Standard-of-care (Risk based)	ref.	ref.	ref.
Birth Cohort  (Intervention)	19.24 (9.70, 38.15)	13.19 (3.58, 48.62)	32.93 (19.34, 56.05)
Sex
Female	ref.	ref.	ref.
Male	0.94 (0.82, 1.06)	1.08 (0.97, 1.20)	1.03 (ref., 1.07)
Ethnicity
Non, Hispanic	ref.	ref.	ref.
Hispanic	0.70 (0.48, 1.01)	0.98 (0.88, 1.09)	2.94 (1.24, 6.98)
Unknown	0.66 (0.57, 0.77)	0.95 (0.92, 0.98)	1.60 (1.05, 2.45)
Race
Black	0.79 (0.67, 0.92)	1.00 (0.91, 1.10)	0.94 (0.83, 1.07)
White	ref.	ref.	ref.
Asian	0.89 (0.68, 1.16)	1.09 (0.82, 1.44)	0.95 (0.79, 1.13)
Other	0.77 (0.42, 1.41)	0.93 (0.79, 1.09)	0.81 (0.36, 1.85)
Unknown	1.07 (0.92, 1.24)	0.98 (0.91, 1.06)	0.35 (0.18, 0.67)
Median Household Income (in dollars) of ZIP Code of Residence
<30,000	0.87 (0.75, 1.01)	0.96 (0.84, 1.10)	1.03 (0.96, 1.10)
30,000, 49,999	0.87 (0.77, 0.98)	0.87 (0.78, 0.96)	1.04 (0.97, 1.10)
50,000, 69,999	ref.	ref.	ref.
70,000, 99,999	0.98 (0.83, 1.16)	1.00 (0.93, 1.08)	0.92 (0.81, 1.05)
>100,000	1.13 (0.95, 1.35)	1.01 (0.96, 1.06)	0.71 (0.54, 0.95)
Unknown	0.60 (0.52, 0.70)	0.88 (0.58, 1.36)	1.02 (0.92, 1.12)
Birth Year
1945, 50	1.50 (1.31, 1.71)	1.11 (0.98, 1.26)	1.11 (1.04, 1.19)
1950, 54	1.41 (1.26, 1.57)	1.05 (0.99, 1.11)	1.01 (0.96, 1.07)
1955, 59	1.16 (ref., 1.34)	1.01 (0.94, 1.09)	1.02 (0.98, 1.05)
1960, 65	ref.	ref.	ref.
Insurance Type
Private	ref.	ref.	ref.
Public	1.27 (1.10, 1.48)	0.82 (0.72, 0.94)	0.81 (0.75, 0.89)
Uninsured or Unknown	0.70 (0.28, 1.71)	0.89 (0.74, 1.07)	0.84 (0.59, 1.20)