Table 2: Distribution of the demographic and social characteristics of term and preterm newborn donor mothers.

	Donor mothers	PTNB mothers	p-value
Age in years (mean±standard deviation)	24.9±5.7	24.9±6.0	0.980
White	89.6%	84.6%	0.606
Married	76.4%	61.5%	0.261
Primigesta	54.8%	41.1%	0.098
Vaginal labor	26.7%	32.0%	0.473
Higher Education	12.3%	23.1%	0.303
Income: 2 to 5 minimum wages	90.5%	76.9%	0.156

PTNB: prerterm newborn.