Table 4.

Stepwise regression analysis of frequency of SSC, HF-HRV, and SNAP on measures of morbidity and short-term developmental outcomes (N = 101)

Outcome variables	Significant predictors	Standardized coefficient (beta)	t-value	Significance	Model R2	F-value
Days on ventilation	HF-HRV	−0.31	−3.22	0.002	0.16	8.68a
	Frequency of SSC	−0.20	−2.10	0.039
Days on oxygen	HF-HRV	−0.34	−3.57	0.001	0.30	13.21a
	Frequency of SSC	−0.22	−2.52	0.013
	SNAP	0.22	2.28	0.025
Length of hospitalization	HF-HRV	−0.41	−4.59	0.000	0.41	20.38a
	Frequency of SSC	−0.28	−2.85	0.005
	SNAP	0.25	2.77	0.007
PMA at discharge	HF-HRV	−0.31	−3.04	0.003	0.09	9.25b

Abbreviations: HF-HRV, high-frequency heart rate variability; PMA, postmenstrual age; SNAP, score for neonatal acute physiology; SSC, skin-to-skin contact.

^ap < 0.001.

^bp < 0.01.