Table 2.

Staged Logistic Regressions for 1996 to 1997 Panel

Variables	Physician Variables Only	Physician + Practice Variables	Physician + Practice + Effect Variables	Physician + Practice + Effect + Perception Variables
Physician variables
Race (white)	—	—	—	—
Gender (female)	-0.042 (0.077)	-0.008 (0.085)	-0.003 (0.087)	-0.051 (0.089)
Salaried	0.392 (0.062)^§	0.001 (0.091)	0.007 (0.092)	-0.033 (0.095)
Specialty
Internal medicine	0.781 (0.293)^†	0.835 (0.355)^*	0.821 (0.356)^*	0.721 (0.387)
Family practice	0.963 (0.292)^§	0.872 (0.357)^*	0.890 (0.358)^*	0.746 (0.390)
Pediatrics	1.368 (0.299)^§	1.399 (0.364)^§	1.411 (0.365)^§	1.251 (0.397)^‡
Began practice after 1975	0.401 (0.067)^§	0.311 (0.077)^§	0.316 (0.078)^§	0.360 (0.081)
Importance of control over decisions (very important)	—	—	—	—
Practice variables
Weeks practicing per year (n)		-0.023 (0.013)	-0.021 (0.014)	-0.018 (0.014)
Hours per week in patient care (n)		0.001 (0.003)	0.000 (0.003)	0.002 (0.003)
Multiple practices		-0.187 (0.121)	-0.190 (0.122)	-0.120 (0.128)
Solo practice		-0.676 (0.094)^§	-0.681 (0.095)^§	-0.678 (0.098)^§
No assistants		-0.155 (0.078)^*	-0.144 (0.079)	-0.070 (0.082)
Frequently obtain high quality services
Ancillary Services		0.451 (0.104)^§	0.441 (0.106)^§	0.230 (0.111)^*
Imaging		0.337 (0.147)^*	0.309 (0.150)^*	0.184 (0.155)
Mental health care		0.241 (0.069)^§	0.245 (0.070)^§	0.120 (0.072)
Referrals		0.744 (0.139)^§	0.750 (0.142)^§	0.592 (0.147)^§
Revenue
From Medicaid (%)		0.001 (0.002)	0.001 (0.002)	0.001 (0.002)
From Medicare (%)		-0.003 (0.002)^*	-0.003 (0.002)^*	-0.004 (0.002)^*
From managed care (%)		-0.007 (0.001)^§	-0.006 (0.001)^§	-0.006 (0.001)^§
Care for adults and children		0.194 (0.165)	0.194 (0.167)	0.198 (0.172)
Patients with formulary (%)		—	—	—
Effect variables
Moderate effect on practice
Computer-generated patient data			0.085 (0.072)	0.087 (0.074)
Guidelines			-0.102 (0.073)	-0.030 (0.075)
Patient profiles			-0.004 (0.075)	0.093 (0.078)
Reminders			-0.035 (0.075)	0.027 (0.077)
Patient surveys			-0.065 (0.074)	-0.082 (0.076)
Computer-generated treatment alternative			0.037 (0.082)	0.025 (0.085)
Information Technology (IT) uses (n)			—	—
Perceptions variables
Expected complexity				-0.683 (0.079)^§
Perceived autonomy				0.873 (0.086)^§
Χ² (p)	145.50 (0.000)	360.55 (0.000)	359.97 (0.000)	567.02 (0.000)
-2LogL	6890.3	5903.5	5766.9	5486.5
Hosmer-Lemeshow Χ² (p)	5.13 (0.645)	13.20 (0.105)	9.37 (0.312)	25.79 (0.001)
Nagelkerke Adjusted R²	0.032	0.088	0.089	0.140

All data provided as β (SE).
* P ≤ .05.
† P ≤ .01.
‡ P ≤ .005.
§ P ≤ .001.