. 2009 Apr 14;32(7):1158–1163. doi: 10.2337/dc08-2247

Table 2.

Impact of intervention group assignment on A1C and LDL cholesterol testing rates and values

	All	Intervention group				P ^*
	All	Control	Patient	Physician	Both	P ^*
A1C testing rate: 1+ test in 6 months (any preintervention A1C value^†)
n	3,107	715	718	895	779	P_pt = 0.34
Preintervention (%)	100	100	100	100	100	P_phys = 0.16
Postintervention (%)	71.2	76.6	69.2^††	70.5^**	68.9^††	P_{pt × phys} = 0.10
A1C testing rate: 1+ test in 12 months (any preintervention A1C value)
n	3,107	715	718	895	779	P_pt = 0.76
Preintervention (%)	100	100	100	100	100	P_phys = 0.07
Postintervention (%)	86.1	87.8	87.2	85.4	84.2	P_{pt × phys} = 0.91
A1C values (any preintervention A1C value)
n	2,673	628	626	763	656	P_pt = 0.51
Preintervention	7.47 ± 1.5	7.39 ± 1.5	7.47 ± 1.5	7.49 ± 1.5	7.52 ± 1.5	P_phys = 0.08
Postintervention	7.35 ± 1.5	7.20 ± 1.4	7.35 ± 1.4	7.42 ± 1.5^**	7.41 ± 1.6^¶	P_{pt × phys} = 0.10
Preintervention A1C ≥8%^§
n	658	149	152	184	173	P_pt = 0.81
Preintervention A1C	9.45 ± 1.4	9.44 ± 1.4	9.47 ± 1.4	9.43 ± 1.5	9.48 ± 1.3	P_phys = 0.02
Postintervention A1C	8.71 ± 1.7	8.50 ± 1.8	8.60 ± 1.6^††	8.85 ± 1.8^††	8.85 ± 1.8^‡‡	P_{pt × phys} = 0.71
LDL cholesterol testing rate: 1+ test in 12 months (any preintervention LDL cholesterol value)^§
n	2,547	614	569	716	648	P_pt = 0.85
Preintervention (%)	100	100	100	100	100	P_phys = 0.02
Postintervention (%)	79.3	83.2	80.1^**	76.3^††	78.2^††	P_{pt × phys} = 0.10
LDL cholesterol values (mg/dl) (preintervention LDL cholesterol ≥ 100 mg/dl)
n	991	254	221	267	249	P_pt = 0.37
Preintervention LDL cholesterol	128 ± 26	128 ± 25	128 ± 28	129 ± 27	129 ± 26	P_phys = 0.33
Postintervention LDL cholesterol^‖	104 ± 31	104 ± 32	101 ± 27	106 ± 34	105 ± 31	P_{pt × phys} = 0.75

Data are means ± SD or percent unless otherwise indicated.

*P_pt = P value for type III patient main effect; P_phys = P value for type III physician main effect; P_{pt × phys} = P value for type III patient × physician interaction.

†Significant covariate × treatment parameter: insulin use × pt.

‡Significant covariate × treatment parameters: age × pt, age × pt × phys, male × pt, male × phys, male × pt × phys, insulin use × pt, insulin use × phys.

§Significant covariate × treatment parameter: male × pt.

‖Significant covariate × treatment parameters: LDL cholesterol × phys, age × pt, glucose eligible × phys, insulin use × phys.

¶P < 0.10;

**P < 0.05;

††P < 0.01;

‡‡P < 0.001 for planned comparison of intervention group relative to control group.