Table 2. Summary of Multilevel Model Predicting Externalizing and Internalizing Behaviors Simultaneously (Sleep Onset Time).

	Externalizing Behaviors a		Internalizing Behaviors a
Variable	B (S.E.)	β	B (S.E.)	β
Fixed Effects
Constant	8.88 (0.62)***	-	6.16 (0.44)***	-
Temperamental Negative Affect a	2.92 (0.63)***	0.53	2.89 (0.44)***	0.92
Sleep Onset Time (decimalized time) b	0.21 (0.71)	0.03	0.08 (0.50)	0.02
Temperamental Negative Affect * Sleep Onset Time	1.42 (0.68)*	0.23	1.44 (0.48)**	0.41
Variance Components
Externalizing Residual Variance	30.85
Internalizing Residual Variance	9.82
Within Person Residual Variance	11.28
Model Fit	1414.12
Estimate Parameters	12

Note: B = Unstandardized Regression Coefficient; S.E. = Standard Error; β = Standardized Regression Coefficient.

^aCaregiver Reported Questionnaire Data;

^bActigraphy Data

^*p < 0.05;

^**p < 0.01;

^***p < 0.001