Table 2.

Tests of between-subjects effects on time to disengagement

Source	F	P	Partial Eta squared	Observed powera
ABR	8.556	0.005	0.135	0.820
Infant's VT during free play at 4 months	0.005	0.946	0.000	0.051
CRIB	2.155	0.148	0.038	0.303
Maternal neonatal STAI Trait scores	0.617	0.436	0.011	0.121
VLBW* for mean gestational age	0.816	0.370	0.015	0.144
Gender	1.206	0.277	0.021	0.190
ABR * VLBW	4.554	0.037	0.076	0.554
ABR * Gender	0.975	0.328	0.017	0.163
VLBW * Gender	0.952	0.333	0.017	0.160
ABR * VLBW * Gender	2.607	0.112	0.045	0.355

^aComputed using alpha = 0.05. *VLBW, very low birth weight (<1400 g, expected 5th percentile weight for 33 weeks gestation); VT, Vagal tone; STAI-T, State and Trait Anxiety index-T index, values in bold = effects accounted by neonatal brainstem dysfunction.