Table 2.

Results of the Hierarchical Regression Predicting Problem Behavior at 17 Months

Step and predictor	b	b SE	b 95% CI	β	t	p
Step 1: F(3, 69) = 0.30, p = .82, R2 = .01
Cumulative risk	−0.13	0.69	[−1.51, 1.28]	−0.03	t(68) = −0.19	.85
Infant-attachment classification (secure vs. disorganized)	1.84	2.45	[−3.04, 6.73]	0.10	t(68) = 0.75	.45
Baseline RSA (natural-log-transformed)	1.02	2.03	[−3.04, 5.08]	0.06	t(68) = 0.50	.62
Step 2: F(4, 68) = 1.96, p = .11, R2 = .10
Cumulative risk	−0.42	0.67	[−11.43, 30.05]	−0.08	t(67) = −0.62	.54
Infant-attachment classification (secure vs. disorganized)	1.42	2.36	[−3.28, 6.12]	0.08	t(67) = 0.60	.55
Baseline RSA (natural-log-transformed)	−1.94	2.25	[−6.43, 2.56]	−0.12	t(67) = −0.86	.39
Infant Attachment × Baseline RSA	11.44	4.37	[2.73, 20.16]	0.36	t(67) = 2.62	.011

Note: CI = confidence interval; RSA = respiratory sinus arrhythmia.