Table 1.

LIFECODES prospective pregnancy cohort profile ($N=173$).

Population characteristics		Count (%)
Preterm birth	Case	58 (33.5)
	Control	115 (66.5)
Age [(y) $n$]	18–24	8 (4.62)
	25–29	32 (18.5)
	30–34	90 (52.0)
	$\ge 35$	43 (24.9)
Race/ethnicity	White	108 (62.4)
	African American	21 (12.1)
	Other	44 (25.4)
Education	High school degree (13 y)	24 (13.9)
	Technical school ($>13\mathrm{y}$)	20 (11.6)
	Junior college or some college ($>13\mathrm{y}$)	57 (32.9)
	College graduate ($\ge 16\mathrm{y}$)	72 (41.6)
Health insurance provider	Private/HMO/self-pay	153 (88.4)
	Medicaid/SSI/MassHealth	19 (11.0)
	Missing	1 (0.58)
BMI at initial visit (${\mathrm{kg}/\mathrm{m}}^2$)	$<25$	84 (48.6)
	$25–29.9$	49 (28.3)
	$\ge 30$	40 (23.1)
Tobacco use	No smoking during pregnancy	161 (93.1)
	Smoked during pregnancy	12 (6.9)
Alcohol use	No alcohol use during pregnancy	163 (94.2)
	Alcohol use during pregnancy	7 (4.0)
	Missing	3 (1.7)
Fetal sex	Female	79 (45.7)
	Male	94 (54.3)

Note: BMI, body mass index; HMO, health maintenance organization; MassHealth, Massachusetts combined Medicaid and Children’s Health Insurance Program; SSI, Supplemental Security Income.