Table 2.

Rates and Counts of Diabetes Encounters, Glycated Hemoglobin Tests, Low-Density Lipoprotein Cholesterol Tests, and Blood Pressure Measures, Comparing Intervention and Control Clinics in the Preintervention and Postintervention Periods

	Intervention Clinic			Control Clinic
Variable	Pre-intervention 12 mo	Post-intervention 12 mo	Change	Pre-intervention 12 mo	Post-intervention 12 mo	Change	Intervention Effect^a	P Value^b
Hemoglobin A_1c=glycated hemoglobin; CI=confidence interval; LDL = low-density lipoprotein.
^a The intervention effect column illustrates the differential amount of change in the intervention arm relative to the control arm comparing pre- with postintervention.
^b P value associated with the time × condition term in a generalized linear mixed model with repeated time measurements, study arm, and their interaction.
^c P <.001.
^d P <.01.
^e P <.05.
Patients with 1 or more encounters or tests, proportion (95% CI)
Diabetes encounters	.850 (.820–.876)	.949 (.932–.962)	.099^c	.875 (.849–.897)	.956 (.941–.967)	.081^c	.018	.78
Hemoglobin A_1c tests	.829 (.788–.864)	.940 (.919–.956)	.112^c	.858 (.822–.888)	.929 (.906–.947)	.071^c	.041	.045
Blood pressure measurements	.986 (.977–.991)	.988 (.980–.993)	.003	.986 (.978–.991)	.981 (.971–.987)	−.005	.008	.28
LDL cholesterol tests	.819 (.779–.854)	.871 (.838–.899)	.052^d	.846 (.809–.876)	.865 (.831–.892)	.019	.033	.14
Encounters or tests done per patient, mean (95% CI), No.
Diabetes encounters	3.9 (3.6–4.4)	4.5 (4.1–4.9)	0.49^d	4.4 (4.1–4.8)	5.1 (4.7–5.5)	0.68^c	−0.20	.33
Hemoglobin A_1c tests	2.0 (1.8–2.1)	2.4 (2.2–2.5)	0.41^c	2.0 (1.8–2.2)	2.3 (2.2–2.5)	0.31^c	0.11	.09
LDL tests	1.4 (1.2–1.5)	1.5 (1.4–1.7)	0.17^d	1.4 (1.3–1.6)	1.5 (1.4–1.6)	0.08	0.09	.09