. Author manuscript; available in PMC: 2010 Apr 30.

Published in final edited form as: Psychol Sci. 2009 Nov 23;21(1):75–79. doi: 10.1177/0956797609354073

Table 2.

Hierarchical Linear Regression Analysis Predicting Differential Maternal Negativity From Sibling Difference in Behavior and Mothers’ Cognitive Performance

Predictor	β
Step 1: main effects^a
Sib diff behavior	0.36^**
Memory	−0.11
Verbal	−0.04
Spatial	0.05
Step 2: interactions^b
Sib Diff Behavior × Memory	−0.19^*
Sib Diff Behavior × Verbal	−0.04
Sib Diff Behavior × Spatial	−0.01

Note: Memory, verbal, and spatial were indexes of the mothers’ cognitive performance, as measured by subtests of the Wechsler Adult Intelligence Scale—Third Edition (Wechsler, 1997). Sib diff behavior = sibling difference in behavior.

The first step of the equation explained a significant portion of variance, F(4, 211) = 13.28, p < .001, R² = .201.

The second step of the equation explained an additional significant portion of variance, ΔF(3, 208) = 3.04, p < .01, ΔR² = .035.

p < .01.

^**

p < .001.