. Author manuscript; available in PMC: 2013 Mar 27.

Published in final edited form as: J Matern Fetal Neonatal Med. 2009 Oct;22(10):905–916. doi: 10.1080/14767050902994663

Table 2.

Demographic and clinical characteristics of patients presenting with spontaneous preterm labor (PTL) and intact membranes.

	PTL without IAI Term delivery (n=76)	p ^a	PTL without IAI Preterm delivery (n=73)	p ^b	PTL with IAI Preterm delivery (n=76)	p ^c
Maternal age (years)	23 (20-27)	NS	23 (20-29.5)	NS	23 (20-28.2)	NS
GA at amniocentesis (weeks)^†	30.7 (28.6-32.3)	NS	29.3 (26.4-32.4)	<0.001	27.4 (24.7-32.5)	<0.001
GA at delivery (weeks)^††	38.7 (37.9-39.9)	<0.001	33.0 (28.9-34.8)	<0.001	27.6 (25.0-32.6)	<0.001
Birth weight (grams)^††	3100 (2778-3387)	<0.001	1956 (1080-2940)	<0.001	1068 (647-1990)	<0.001

Values expressed as median (interquartile range)

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

p between PTL without IAI who delivered at term and PTL without IAI who delivered preterm

p between PTL without IAI who delivered preterm and PTL with IAI who delivered preterm

p between PTL without IAI who delivered at term and PTL with IAI who delivered preterm

^†

p=0.006,

^††

p<0.001, Kruskal-Wallis test with Bonferroni correction.