Table 3.

Negative binomial regressions predicting children's aggressive behavior scores at school entry as a function of family composition at age 4, various specifications (ECLS-B)

	Model 1			Model 2			Model 3			Model 4
	B	SE		B	SE		B	SE		B	SE
Race/ethnicity (vs. Non-Hispanic white)
Non-Hispanic Black	−0.026	0.027		−0.051	0.027	†	−0.052	0.027	†	−0.052	0.027	†
Hispanic, any race	−0.014	0.022		−0.011	0.023		−0.008	0.023		−0.008	0.022
Other race	−0.034	0.028		−0.039	0.028		−0.038	0.027		−0.038	0.027
Male	0.189	0.017	***	0.190	0.017	***	0.191	0.017	***	0.191	0.017	***
Child age in months	−0.007	0.002	***	−0.007	0.002	***	−0.007	0.002	***	−0.007	0.002	***
Mother cohabiting at birth (vs. married)	0.031	0.024		0.009	0.024		−0.002	0.024		−0.002	0.024
Mother single at birth (vs. married)	0.025	0.031		−0.030	0.034		−0.041	0.033		−0.042	0.033
Child temperament at 9 months	0.028	0.004	***	0.029	0.004	***	0.029	0.004	***	0.029	0.004	***
Mother's age at child's birth	−0.005	0.002	**	−0.004	0.002	*	−0.004	0.002	*	−0.003	0.002	*
Mother's education
Less than high school	0.021	0.028		0.028	0.028		0.024	0.027		0.024	0.027
Some post secondary education	−0.005	0.023		−0.002	0.023		0.001	0.023		0.002	0.023
College graduate or more	−0.037	0.027		−0.034	0.026		−0.029	0.026		−0.029	0.027
Sibship composition
Child is second-born	0.064	0.022	**	0.099	0.020	***	0.061	0.022	**	0.062	0.022	**
Child is third-born or higher	−0.011	0.031		0.066	0.023	**	−0.023	0.031		−0.021	0.031
Child has 1 full sibling	−0.001	0.024					0.023	0.025		0.022	0.025
Child has 2+ full siblings	0.062	0.030	*				0.093	0.031	**	0.091	0.031	**
Any step- or half-siblings	0.130	0.027	***				0.126	0.027	***
Mother's union status
Mother is unpartnered				0.137	0.026	***	0.141	0.026	***
Stepfather/social father				0.134	0.041	**	0.108	0.042	*
Complex sibship and union status
Stepfather/no sibs										0.084	0.055
No father/no sibs										0.146	0.029	***
Bio father/step-half sibs										0.126	0.034	***
Stepfather/step-half sibs										0.258	0.058	***
No father/step-half sibs										0.253	0.044	***
Intercept	2.520	0.142	***	2.492	0.140	***	2.463	0.142	***	2.461	0.141	***
/lnalpha	−2.120	0.056		−2.127	0.056		−2.142	0.057		−2.14	0.057
N~6550
Significant post-hoc tests in model 4

Stepfather with no half/step sibs vs. stepfather with half/step sibs (p<.05)

Stepfather with no half/step sibs vs. unpartnered mother with half/step sibs (p<.05)

Unpartnered mother with no half/step sibs vs. stepfather with half/step sibs (p<.10)

Unpartnered mother with no half/step sibs vs. unpartnered mother with half/step sibs (p<.05)

Biological/adoptive father with half/step sibs vs. stepfather with half/step sibs (p<.05)

Biological/adoptive father with half/step sibs vs. unpartnered mother with half/step sibs (p<.01)