. Author manuscript; available in PMC: 2011 Jan 20.

Published in final edited form as: J Matern Fetal Neonatal Med. 2010 Jan;23(1):34–47. doi: 10.3109/14767050903009248

Table II. Demographic and clinical characteristics of patients presenting with spontaneous preterm labor with intact membranes.

	PTL without IAI Term delivery (n=99)	p	PTL without IAI Preterm delivery (n=80)	p^a	PTL with IAI Preterm delivery (n=59)	p^b
Maternal age (years)	23 (18-31)	NS	22 (19-30)	NS	22 (19-28)	NS
GA at amniocentesis (weeks)	31.6 (29.4-33.4)	NS	32.1 (30.4-33.3)	0.02	29.7 (25.3-33.3)	0.01
GA at delivery (weeks)	38.7 (38-39.9)	<0.01	34.7 (33.3-35.7)	<0.01	31.1 (25.9-33.3)	<0.01
Birthweight (grams)	3,230 (2,970-3,550)	<0.01	2,377 (1,982-2,740)	<0.01	1,640 (850-2,200)	<0.01

Values expressed as median (interquartile range)

p: comparison between PTL who delivered at term and PTL without IAI

p^a: comparison between PTL who delivered preterm without IAI and PTL with IAI

p^b: comparison between PTL who delivered at term and PTL with IAI

PTL: preterm labor; GA: gestational age; IAI: intra-amniotic infection/inflammation NS: not significant