. Author manuscript; available in PMC: 2013 Jan 31.

Published in final edited form as: J Matern Fetal Neonatal Med. 2010 Feb;23(2):120–130. doi: 10.3109/14767050903026481

Table II.

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

	PTL without IAI Term delivery (n=149)	p	PTL without IAI Preterm delivery (n=108)	p^a	PTL with IAI Preterm delivery (n=69)	p^b
Maternal age (years)	22 (19 – 30)	NS	22 (19 – 30)	NS	23 (20 – 27)	NS
GA at amniocentesis (weeks)	31.8 (29.4 – 33.3)	NS	31.9 (29.8 – 33.0)	<0.001	28.5 (24.9 – 32.7)	<0.001
GA at delivery (weeks)	38.7 (37.9 – 39.7)	<0.001	34.6.5 (33.1 – 35.5)	<0.001	29.4 (25.2 – 32.9)	<0.001
Birth weight (grams)	3165 (2899–3532)	<0.001	2335 (1940–2677)	<0.001	1140 (699–1995)	<0.001

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