Table 1.

Analysis of parameter estimates: Zero-corrected, negative binomial model to predict Black infant mortality for 1999–2003 in 330 US counties

Parameter	DF	Estimate	Standard Error	Wald 95%	Confidence Limits	Chi-Square	P
Intercept	1	6.98	0.15	6.68	7.27	2105.37	<.001
Percent foreign born	1	−1.13	0.22	−1.56	−0.69	25.97	<.001
Percent Blacks ages 18 to 64, speaking   little or no English	1	−8.29	3.12	−14.42	−2.17	7.04	.008
Socioeconomic index*	1	0.001	0.002	0.01	0.01	15.39	<.001
Household income (1990)	1	0.05	0.004	−0.001	−0.000	5.58	.018
Dispersion	1	0.046	0.004	0.04	0.05

^*Equals ranks for (percent Black women aged ≥ 25 years who are not high school graduates + percent of Blacks with annual income below poverty + reciprocal of Black per capita income)/3. The higher value of the index, the lower the socioeconomic status of the county