Table 5. Regression estimates of Medicaid supply responses for participating primary care solo-practice physicians: California, 1974-78.

Item	Dependent variables
	Total RVU's1 per quarter		RVU's1 per patient		Patients per physician
	Coefficient	t statistic	Coefficient	t statistic	Coefficient	t statistic
INDEPENDENT VARIABLE
Price In dollars
Private price	−3,831.4	−2.95	−13.78	2.29	−79.45	3.37
Medicaid price	4,814	1.53	2.48	0.17	99.76	1.74
Medicaid eligibility
Nonaged eligibles per physician	40.86	6.80	0.13E-1	0.45	0.92	8.38
Proportion of population:
Disabled	2,297.4	0.42	−40.58	−1.59	84.44	0.85
On AFDC2	14,952	4.93	59.60	4.24	201.60	3.66
Medically needy	25,894	3.92	219.00	7.16	209.10	1.74
Physician supply
Physicians to non-Medicaid population	2.33E6	3.78	3,165	1.11	38,493	3.44
Physicians to non-Medicaid population (squared)	−3.31E7	−3.35	15.95E4	0.35	−4.99E6	−2.78
CONTROL VARIABLE
Physician characteristic
Years experience	−229.3	−4.54	−0.79	−3.39	−2.63	−2.86
Years experience (squared)	1.77	0.89	0.48E-2	1.18	.022E-1	1.34
Internal medicine binary	−1,528	−5.78	23.66	19.33	−56.61	−11.79
Pediatrics binary	2,572	5.53	−3.93	−1.82	73.91	8.75
Obstetrics-gynecology binary	6,588	17.54	66.78	38.41	−1.13	−0.17
Orthopedic surgery binary	—	—	—	—	—	—
Cost of inputs
Housing cost	−18.28	−2.00	0.95E-1	2.24	−0.45	−2.73
Wages in physicians' offices	1.32	0.44E-2	−0.59E-1	−0.43	0.47	0.87
Population per square mile	500.0	3.36	−0.58	−0.83	6.80	2.48
Year binary
1975	1,157	3.01	8.22	4.62	8.67	1.24
1976	2,170	4.91	12.73	6.23	21.61	2.70
1977	2,005	3.76	−2.07	−0.84	41.38	4.27
1978	1,754	3.00	−9.87	−3.66	51.75	4.89
OTHER STATISTICS
Constant	−117.8	−1.94	−9,616.5	−2.87	4.21	0.27
Mean of dependent variable	4,942.7		59.1		93.9
R2	0.12		0.10		0.30
Sample size	5,065		5,065		5,065

¹Relative value units.

²Aid to Families with Dependent Children.

NOTE: Participation is defined as seeing 10 or more different Medicaid patients per quarter. E is an exponent to the base 10.