Table 1:

Maternal Characteristics for Weighted Sample

	Mean, SD or Weighted (%)
	Total Sample	Very Preterm	Moderate/ Late Preterm	Full term	p
Unweighted N	8200	800	1500	5900
Age (years)	27.4, 3.5	27.3, 9.8	27.4, 9.6	27.4, 3.8	.95
Depressive symptoms					.08
No depressive symptoms	59.2%	55.1%	55.8%	59.7%
Mild depressive symptoms	24.2%	23.5%	27.0%	23.9%
Moderate-severe depressive symptoms 16.5%		21.4%	17.2%	16.4%
Race/ ethnicity					< .001
White / Non-Hispanic	60.2%	50.6%	52.3%	61.3%
Black / Non-Hispanic	13.9%	26.1%	19.5%	13.0%
Hispanic	20.3%	20.2%	22.2%	20.0%
Asian	3.2%	2.1%	2.8%	3.2%
Other	2.5%	0.9%	3.1%	2.4%
Marital Status					< .001
Married	68.0%	61.2%	61.2%	68.9%
Unmarried	32.0%	38.8%	38.8%	31.1%
History of Prenatal Smoking					.59
No	89.0%	87.0%	88.2%	89.1%
Yes	11.0%	13.0%	11.8%	10.9%
Plurality					< .001
Singleton	96.7%	79.4%	84.5%	98.5%
Twin or greater	3.3%	20.6%	15.5%	1.5%
Ever Breastfed					< .001
No	30.6%	44.8%	38.6%	29.4%
Yes	69.4%	55.2%	61.4%	70.6%
Socioeconomic indicators calculated from measures of education and income at 9-months:
Maternal Education					.01
Less than high school	17.3%	21.4%	20.7%	16.8%
High school graduate	28.3%	28.1%	29.1%	28.2%
> High School	54.4%	50.5%	50.2%	55.0%
Below poverty threshold					< .001
(<185% federal poverty line)	46.0%	55.4%	53.4%	44.9%
At or above poverty threshold
(≥185% federal poverty line)	54.0%	44.6%	46.6%	55.1%