Table 4.

Staged Logistic Regressions for 2000 to 2001 Panel

Variables	Physician Variables Only	Physician + Practice Variables	Physician + Practice + Effects Variables	Physician + Practice + Effect + Perceptions Variables
Physician Variables
Race (white)	0.080 (0.071)	0.049 (0.080)	0.081 (0.083)	0.069 (0.085)
Gender (female)	-0.024 (0.068)	-0.079 (0.076)	-0.083 (0.077)	-0.077 (0.079)
Salaried	0.341 (0.060)^§	0.056 (0.076)	0.049 (0.077)	0.022 (0.079)
Specialty
Internal medicine	-0.034 (0.331)	-0.092 (0.379)	-0.076 (0.380)	-0.159 (0.395)
Family practice	0.143 (0.331)	0.106 (0.378)	0.113 (0.379)	0.048 (0.394)
Pediatrics	0.700 (0.336)^*	0.732 (0.387)	0.759 (0.387)^*	0.653 (0.403)
Began practice after 1975	0.103 (0.080)	0.261 (0.091)^‡	0.243 (0.092)^†	0.232 (0.094)^*
Importance of control of decisions (very important)	-0.046 (0.066)	-0.078 (0.073)	-0.068 (0.073)	-0.028 (0.075)
Practice variables
Weeks practicing per year (n)		-0.040 (0.013)^‡	-0.036 (0.013)^†	-0.030 (0.014)^*
Hours per week in patient care (n)		-0.011 (0.003)^§	-0.011 (0.003)^§	-0.010 (0.003)^§
Multiple practices		-0.168 (0.118)	-0.171 (0.119)	-0.184 (0.121)
Solo practice		-0.369 (0.084)^§	-0.351 (0.085)^§	-0.308 (0.087)^§
No assistants		—	—	—
Frequently obtain high-quality services
Ancillary services		0.444 (0.094)^§	0.446 (0.095)^§	0.267 (0.099)^†
Imaging		0.284 (0.142)^*	0.301 (0.143)^*	0.164 (0.147)
Mental health care		0.404 (0.070)^§	0.374 (0.070)^§	0.270 (0.072)^§
Referrals		0.545 (0.126)^§	0.564 (0.127)^§	0.379 (0.132)^‡
Revenue
From Medicaid (%)		0.003 (0.002)	0.003 (0.002)	0.003 (0.002)
From Medicare (%)		-0.002 (0.002)	-0.003 (0.002)	-0.002 (0.002)
From managed care (%)		-0.004 (0.001)^‡	-0.004 (0.001)^‡	-0.003 (0.001)^*
Care for adults and children		—	—	—
Patients with formulary (%)		-0.001 (0.002)	-0.001 (0.002)	-0.001 (0.002)
Effect variables
Moderate effect on practice
Computer-generated patient data			—	—
Guidelines			0.005 (0.071)	0.038 (0.072)
Patient profiles			-0.047 (0.074)	0.016 (0.076)
Reminders			—	—
Patient surveys			0.176 (0.071)^*	0.212 (0.073)^‡
Computer-generated treatment alternative			—	—
Information Technology (IT) uses (#)			0.026 (0.018)	0.025 (0.019)
Perceptions variables
Expected complexity				-0.437 (0.078)^§
Perceived autonomy				0.934 (0.085)^§
Χ² (p)	118.04 (0.000)	345.96 (0.000)	352.36 (0.000)	516.59 (0.000)
-2LogL	7251.3	6198.6	6108.4	5855.8
Hosmer-Lemeshow Χ² (p)	3.69 (0.884)	13.54 (0.095)	5.84 (0.665)	6.88 (0.549)
Nagelkerke Adjusted R²	0.025	0.081	0.083	0.122

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