Table 3.

Comparison of Fixed Effect Regression Results for Pertussis Count Pre‐ versus Post‐1994

Variables	(1) Pertussis	(2) Post‐1994	(3) Post‐1994 Interaction
Log real nonhospital state health spending net of capital	4.34 [.619]	3.65 [.676]	3.17 [.718]
Log real state expenditure ($1,000s)	7.88 [.773]	5.31 [.846]	0.38 [.990]
Log real hospital health spending by states	2.79 [.572]	3.89 [.434]	3.88 [.435]
Log real Medicaid spending	9.03 [.274]	9.26 [.262]	9.46 [.252]
Number of white births	0.00*** [.000]	0.00*** [.000]	0.00*** [.000]
Number of black births	0.00 [.166]	0.00* [.059]	0.00* [.063]
Population	−0.02*** [.000]	−0.02*** [.000]	−0.02*** [.000]
Year	−0.86 [.422]	−1.83 [.116]	−1.60 [.197]
Year × State	0.03 [.181]	0.02 [.196]	0.02 [.231]
Post‐1994 (vaccines for children program)		19.83** [.037]	1.88 [.955]
Post‐1994 interaction with log total State Health Spending			1.18 [.574]
Constant	165.55 [.916]	2,164.08 [.240]	1,860.45 [.333]
Observations	1,326	1,326	1,326
R 2	0.034	0.037	0.038
Number of state	51	51	51
Rho	0.989	0.989	0.987

p‐value in brackets.

***p < .01, **p < .05, *p < 0.1.