Table 2.

Hierarchical Regression Models Predicting Internalizing Behaviors at age 3

	Anxious/Depressed Behaviors				Withdrawn Behaviors
	RSA Model 1 b (SE)	RSA Model 2 b (SE)	HP Model 1 b (SE)	HP Model 2 b (SE)	RSA Model 1 b (SE)	RSA Model 2 b (SE)	HP Model 1 b (SE)	HP Model 2 b (SE)
Sex (0 = male )	.25 (.27)	.29 (.28)	.25 (.27)	.28 (.27)	−.43 (.29)^	−.37 (.29)	−.42 (.29)^	−.39 (.28)
Race (0 = AA)	−.12 (.32)	−.13 (.31)	−.11 (.32)	−.10 (.31)	−.12 (.34)	−.16 (.34)	−.11 (.33)	−.13 (.34)
Family Income	−.01 (.06)	−.01 (.06)	−.00 (.06)	−.01 (.06)	−.01 (.06)	−.01 (.06)	−.01 (.06)	−.01 (.06)
Infant Height	.15 (.12)	.15 (.12)	.15 (.12)	.15 (.12)	−.05 (.12)	−.08 (.12)	−.05 (.12)	−.08 (.12)
Child Age (36m)	.25 (.17)	.25 (.18)	.25 (.17)	.24 (.17)	.01 (.19)	−.04 (.19)	−.01 (.19)	−.02 (.18)
ANS Measure	−.05 (.16)	−.02 (.16)	−.01 (.01)	−.01 (.01)	−.10 (.16)	−.07 (.16)	−.01 (.01)	−.01 (.01)
Sensitivity	−.50 (.20)*	−.46 (.20)*	−.49 (.21)*	−.48 (.20)*	−.40 (.20)*	−.38 (.20)^	−.38 (.20)^	−.43 (.20)*
Negative Intrusion	.41 (.24)^	.42 (24)^	.41 (.24)^	.47 (.24)^	.06 (.21)	.07 (.22)	.06 (.21)	.02 (.22)
Sensitive Caregiving x ANS Measure	-	−.02 (.26)	-	-	-	−.51 (.26)^	-	−.01 (.01)*
Negative Intrusion x ANS Measure	-	−.32 (.21)^	-	−.01 (.01)*	-	−.20 (.20)		-

Notes: p ≤ .10^,

p ≤ .05*;

ANS: Autonomic Nervous System; RSA: Respiratory Sinus Arrhythmia; HP: Heart Period; AA: African American; Trimmed models are presented for the second heart period model for both outcomes.