Table 4.

Unadjusted and adjusted multivariable models examining regimen characteristics and health-related factors with A1C

Variable	Unadjusted model		Adjusted with overall MRCI
	B (95% CI)	P value	B (95% CI)	P value
Age
< 50	-----		-----
50–63	−0.60 (−1.07, −0.14)	0.01	−0.12 (−0.65, 0.42)	0.40
64+	−0.98 (−1.52, −0.43)	0.001	−0.26 (−0.83, 0.31)	0.37
Gender
Female	-----		-----
Male	0.65 (0.25, 1.04)	0.001	0.58 (0.16, 0.99)	0.01
Household income
Less than $15,000	-----		-----
$15,000-$30,000	0.20 (−0.22, 0.61)	0.36	−0.02 (−0.46, 0.41)	0.91
More than $30,000	1.00 (0.36, 1.64)	0.01	0.53 (−0.17, 1.23)	0.14
Insurance
Self-pay/none	-----		-----
Medicare + Medicaid	−1.06 (−1.71, −0.42)	0.001	−1.15 (−1.90, −0.39)	0.01
Medicare	−1.02 (−1.57, −0.46)	0.001	−0.94 (−1.56, −0.32)	0.01
Medicaid	−0.68 (−1.79, −0.18)	0.01	−0.71 (−1.26, −0.17)	0.01
Private/HMO	−−0.30 (−0.96, 0.35)	0.37	−0.55 (−1.27, 0.17)	0.17
Overall MRCI
<14	-----		-----
14–18.4	0.74 (0.21, 1.28)	0.01	0.97 (0.40, 1.54)	0.01
18.5–26	0.74 (0.19, 1.30)	0.01	1.04 (0.45, 1.64)	0.01
>26	0.46 (−0.07, 0.99)	0.09	1.13 (0.53, 1.72)	0.001
Outpatient visit utilization (past 6 mo)
1	-----		-----
2	−0.35 (−0.86, 0.16)	0.17	−0.35 (−0.86, 0.16)	0.17
3–4	−0.45 (−1.01, 0.11)	0.11	−0.45 (−1.01, 0.11)	0.11
5+	−0.92 (−1.53, −0.30)	0.01	−0.92 (−1.53, −0.30)	0.01

Abbreviations used: HMO, health maintenance organization; B, beta coefficient; MRCI, medication regimen complexity index.

Note: Adjusted models included all variables in the table (with MRCI as the exception) and adjusted for intervention arm and number of days between baseline interview and A1C collection date.