Table 5.

Summary of Hierarchical Regression Analysis for Variables Predicting Infant Warmth

Variable	B	SE B	β
Step 1
Infant Birth Weight	.0003	.000	.346*
Maternal Age	.0016	.006	.022
Child Sex	.0725	.061	.096
Step 2
Group	.0640	.059	.085
Step 3
Alcohol Use	.0702	.065	.089
Marijuana Use	−.0151	.066	−.019
Step 4
Ongoing Drug Use	.0562	.061	.075
Step 5
Group × Ongoing Drug Use	.1890	.120	.414

Note: Total R² = .16, F(8, 136) = 3.19, p < .01. R² = .12 for Step 1; R^{2 change} = .01 for Step 2; R^{2 change} = .01 for Step 3; R^{2 change} = .01 for Step 4; R^{2 change} = .02 for Step 5.

^*p < .01.