Table 2.

Summary of Hierarchical Linear Model Predicting Behavior Problems (N = 508)

		Behavior problems intercept centered at 54M	Behavior problems slope
	Predictor variables	B	B
Step 1
	Maternal education at 1 month	.06	−.04
	Income to needs ratio (across 54 months)	.18	−.05
	Maternal depression (across 54 months)	−.03	< −.01
	Parenting quality (across 54 months)	−2.63**	.03
	Partner presence (across 54 months)	−.05**	< .01
	Child temperament at 6 months	−.17	−.18
	Child gender (1=male; 2=female)	−.02	.02
	Child care quality (across 54 months)	.02	.37
	Child care hours (across 54 months)	.08**	−.01**
	Center child care (across 54 months)	4.00**	−.28
	Child DRD4 (0=7R absent; 1=7R present)	.59	−.21
	Child 5-HTTLPR (0=l/l; 1=l/s; 2=s/s)	−.15	−.18
Step 2
	DRD4 X child care quality	−6.23*	.96#
	DRD4 X child care hours	.07	−.02*
	DRD4 X center child care	2.66	−.97*

Note. The model included the following time variant covariates from 54 months through 6^th grade which are not displayed in the table: income to needs ratio, maternal depression, parenting quality, partner presence, classroom quality, after school activities. The displayed coefficients of the variables at step1 represent the values before inclusion of interaction terms at step2.

^#p < .10.

^*p < .05.

^**p < .01.