Table 1.

Decomposition of Income-related Concentration Index (CI)

Variable	${\widehat{\beta }}_k$		$C_{\mathit{kt}}$			${\xi }_{\mathit{kt}}={\widehat{\beta }}_k{\overline{w}}_{\mathit{kt}}∕{\overline{h}}_t$			${\widehat{I}}_{\mathit{kt}}$
	coef.	s.d.	CDS-I	CDS-II	CDS-III	CDS-I	CDS-II	CDS-III	CDS-I	CDS-II	CDS-III
African-American	−0.483***	(0.086)	−0.492	−0.483	−0.509	−0.035	−0.033	−0.033	14.46%	15.01%	14.94%
Latino	−0.699***	(0.133)	−0.425	−0.400	−0.350	−0.055	−0.056	−0.058	19.57%	20.75%	18.03%
Age	0.059**	(0.020)	0.009	0.005	0.001	0.137	0.307	0.478	0.98%	1.38%	0.26%
Age square	−0.003**	(0.001)	0.010	0.009	0.001	−0.036	−0.153	−0.349	−0.31%	−1.34%	−0.43%
Log Family Income	0.145***	(0.036)	0.387	0.295	0.295	0.104	0.120	0.130	33.98%	32.87%	34.13%
Child lives with both parents	0.047	(0.075)	0.141	0.162	0.162	0.021	0.018	0.018	2.53%	2.80%	2.62%
Metropolitan area	0.172*	(0.067)	0.107	0.074	0.078	0.040	0.039	0.039	3.61%	2.67%	2.73%
Smoking in the FU	−0.072	(0.070)	−0.200	−0.197	−0.481	−0.011	−0.010	−0.005	1.90%	1.91%	2.02%
Mother some college	0.286*	(0.120)	0.064	0.069	0.029	0.046	0.045	0.046	2.49%	2.88%	1.17%
Mother college graduate	0.340*	(0.147)	0.492	0.471	0.492	0.037	0.034	0.036	15.31%	14.89%	16.00%
Mother post graduate	0.364*	(0.180)	0.470	0.502	0.525	0.015	0.015	0.016	5.77%	6.96%	7.48%
Low birth weight	−0.101	(0.119)	−0.158	−0.289	−0.402	−0.003	−0.003	−0.003	0.44%	0.86%	1.17%
CI of child health			0.119	0.107	0.112
Standard error of CI			(0.007)	(0.006)	(0.006)
Sample Size			1058	1058	1058

^*Note: Table 1 shows decomposition results for a subset of covariates used in the model. The CI of child health is the estimate of the income-related concentration index that we decompose. The full list of covariates in the regression and decomposition includes: log family income, age, age square, child gender, child race/ethnicity (African-American, Latino, Other), number of children in the family, child lives with both parents, mother’s age when child was born, child lives in metropolitan area, smoking in the family unit, child has any kind of health insurance, mother is high school graduate, mother has some college education, mother is college graduate, mother has some post-graduate education, mother is employed, mother is retired/temporarily laid off/sick leave or maternity leave, mother is a student or homemaker, mother has other employment status, primary care-giver is not mother, primary care-giver is female, child has at least one chronic health condition, child born with low birth weight. ${\widehat{\beta }}_k$ is the coefficient of each covariate in the regression. Standard errors in parentheses, p<0.05,

^**p<0.01,

^***p<0.001.

C_kt is the income-related concentration index of the covariate. ξ_kt is the elasticity of the covariate, and ${\widehat{I}}_{\mathit{kt}}$ is the percentage contribution of the covariate to the income-related health inequality. The standard errors of the concentration indices were generated using bootstrapping.