Table 3.

Pregnancy outcomes of study population

Characteristics	Intra-amniotic inflammation (−)/ MIAC (−) (Group 1, n=55)	P*	Adjusted P*,§	Intra-amniotic inflammation (+)/ MIAC (−) (Group 2, n=26)	P†	Intra-amniotic inflammation (+)/ MIAC (+) (Group 3; n=9)	P‡	Adjusted P‡,§
Gestational age at delivery, weeks**,††	34.0 (31.4–35.1)	.004	-	30.2 (26.1–34.6)	NS	28.4 (25.9–33.1)	.003	-
Spontaneous delivery
<24 hours	6/54 (11%)	.001	.002	12/26 (46%)	NS	5/9 (56%)	.006	.003
<48 hours	7/54 (13%)	<.001	<.001	16/26 (62%)	NS	5/9 (56%)	.009	.007
<7 days	17/53 (32%)	<.001	<.001	23/26 (89%)	NS	7/9 (78%)	.021	.017
Spontaneous preterm delivery
<34+0 weeks‡‡	23/50 (46%)	.003	.021	18/21 (86%)	NS	7/8 (88%)	NS	NS
<36+0 weeks	40/49 (81%)	NS	NS	25/26 (96%)	NS	8/8 (100%)	NS	NS
Acute histologic chorioamnionitis	12/46 (26%)	NS	NS	11/21 (52%)	NS	5/8 (63%)	NS	NS
Funisitis	2/47 (4%)	NS	NS	4/21 (19%)	NS	4/8 (50%)	.003	.003

Data presented as median (interquartile range) or n/N (%)

MIAC, microbial invasion of amniotic cavity; NS, not significant.

^*Comparison between groups 1 and 2.

^†Comparison between groups 2 and 3.b

^‡Comparison between groups 1 and 3.

^§Adjusted for gestational age at amniocentesis and the cervical dilatation (logistic regression analysis).

^**Two women whose gestational age at delivery were not known were excluded.

^††P<.05 by Kruskal-Wallis ANOVA test.

^‡‡Cases with gestational age at amniocentesis ≥ 34⁺⁰ weeks were excluded from the analysis.