Table 3.

Logistic Regression Results^†

	Model 1 ADG Model	Model 2 Add Patient Utilization and Utilization–Capitation Interactions
Patient Demographics
26–35 years	0.83(0.65, 1.07)	0.84(0.65, 1.09)
36–55 years	0.73(0.56, 0.93)*	0.76(0.59, 0.99)
56–65 years	0.44(0.32, 0.61)***	0.51(0.37, 0.70)***
Female	1.29(1.12, 1.48)***	1.20(1.04, 1.39)*
Patient Case-Mix
ADG10: chronic medical stable	0.94(0.18, 4.83)	0.65(0.02, 18.33)
ADG10-capitation interaction	1.36(1.02, 1.80)*	1.28(0.95, 1.73)
Other Diagnoses Categories
Sexually transmitted diseases	1.08(0.68, 1.74)	1.15(0.73, 1.83)
Drug use	2.07(1.11, 3.86)*	2.01(1.08, 3.73)*
General diagnoses	1.04(0.92, 1.18)	1.10(0.96, 1.25)
Patient Utilization
Time since previous encounter		1.01(1.01, 1.02)***
Time since previous encounter squared		0.99(0.99, 0.99)***
2 previous encounters		0.70(0.57, 0.87)**
3 previous encounters		0.29(0.20, 0.41)***
4 or 5 previous encounters		0.16(0.10, 0.26)***
6–19 previous encounters		0.08(0.04, 0.14)***
20+previous encounters		0.16(0.05, 0.48)**
% of previous encounters—short		1.19(0.97, 1.46)
% of previous encounters with OPCTP		3.10(2.46, 3.92)***
% of previous encounters with specialists		1.69(1.35, 2.10)***
Patient Utilization–Capitation Interactions
Time since previous encounter		1.02(1.01, 1.03)***
Time since previous encounter squared		0.99(0.99, 1.00)
2 previous encounters		1.06(0.82, 1.38)
3 previous encounters		2.11(1.44, 3.11)***
4 or 5 previous encounters		3.06(2.05, 4.56)***
6–19 previous encounters		5.14(3.21, 8.23)***
20 + previous encounters		2.49(0.89, 6.97)
Cstatistic	.817	.853
Hosmer-Lemeshow Test	χ2 8df=6.61 p=0.58	χ2 8df=12.31 p=0.14

^†Results are reported as odds ratios with confidence intervals in parentheses.

^*Significant at p<.05;

^**significant at p<.01;

^***significant at p<.001