Table 4.

Demographic and Risk Characteristics at Baseline by Preterm or Very Preterm Birth

Characteristic	PTB (n=102)	Not PTB (n=716)	VPTB (n=30)	Not VPTB (n=788)
Maternal Age (mean ± SD)	26.1 ± 6.6*	24.4 ± 5.3	25.8 ± 6.2	24.5 ± 5.4
Education ≥ High School	74%	71%	73%	72%
Married/Living with Partner	23%	25%	27%	25%
Medicaid Recipient	81%	78%	80%	79%
PNC Initiation (weeks) (mean ± SD)	12.5 ± 6.2	13.2 ± 6.3	11.3 ± 6.1	13.2 ± 6.3
Number of PNC visits (mean ± SD)	7.6 ± 3.1	9.2 ± 3.4	6.1 ± 2.7	9.1 ± 3.4
Alcohol use during pregnancy	24%	21%	20%	22%
Illicit drug use during pregnancy	13%	12%	10%	12%
Active Smoking	23%	17%	20%	18%
ETSE	70%	73%	66%	73%
Depression	53%**	43%	63%†	43%
IPV	42%***	31%	57%‡	31%

^*p=0.010

^**p=0.046,

^***p=0.021,

^†p=0.028,

^‡p=0.003

PTB: preterm births, VPTB: very preterm birth, PNC: prenatal care, ETSE: environmental tobacco smoke exposure, IPV: intimate partner violence.