Table 5.

Hierarchical Multiple Regression of PPD Symptom Severity on Sleep Quality Measures.

Model		B	SE B	β	t	Δ R2
1	(Constant)	95.35	19.58		4.87	0.32
	Infant gender	−10.84	9.01	−.17	−1.20
	Income	−5.16	2.81	−.25	−1.84
	Number of infant
	awakenings	6.61	2.26	.41	2.92
2	(Constant)	−561.59	317.38		−1.77	0.20
	Infant gender	−14.99	8.74	−.24	−1.72
	Income	−2.19	2.79	−.11	−.79
	Number of infant
	awakenings	4.35	2.18	.27	2.00*
	Wake after sleep onset	6.85	2.85	1.19	2.40*
	Sleep latency	1.80	.73	.32	2.46*
	Sleep efficiency	−6.31	3.13	−1.04	−2.01*
	Wake episodes	2.97	1.92	.25	1.55

^*p<0.05