Table I.

Demographic and clinical characteristics of the study population

	Normal pregnancy (n= 86)	Preterm PROM (n= 123)	P value
Maternal age (years)	24 (21-27)	24 (10.25-31)	0.09
Gravidity€
1	18 (21.4%)	18 (14.6%)
2-5	53 (63.1%)	78 (63.4%)	0.3
≥6	13 (15.5%)	27 (22%)
Parity§
1	46 (54.1%)	59 (48.8%)
2-5	38 (44.7%)	53 (43.8%)	0.1
≥6	1 (1.2%)	9 (7.4%)
Ethnic origin £
African-American	67 (80.7%)	105 (85.4%)
Caucasian	11 (13.3%)	16 (13.0%)
Hispanic	2 (2.4%)	1 (0.8%)	0.119
Asian	3 (3.6%)	1 (0.8%)
Gestational age at blood collection (weeks)	31.1 (27.4-35)	30.1 (26-32.5)	0.024
Gestational age at delivery (weeks)	39.6 (38.4-40.7)	31.6 (27.2-33.1)	<0.0001
Induction of labor	16 (22.9%)	49 (42.6%)	0.006
Cesarean delivery*	24 (33.8%)	34 (27.9%)	0.5
Neonatal birthweight	3342.5 (3050-3700)	1580 (957-2040)	<0.0001

Data are presented as median (interquartile range) or numbers (%)

^€Normal pregnancy (n= 84)

^§Normal pregnancy (n= 85)

^£Normal pregnancy (n=68)

^*Normal pregnancy (n=71); Preterm PROM ( n=122)

PROM – prelabor rupture of membranes