Table 5.

Inflammation and MIAC by gestational age at delivery among cases.

	<32 + 0 weeks	>32 weeks	p value
n	11	16
Gestational age in weeks at AC	29 (27–31)	30 (22–31)	0.8
AF MMP-8 concentration at AC, ng/mL	2131 (3–5431)	7.1 (3.1–144)	0.019
AF inflammation, n (%)	8 (73%)	1 (6%)	0.031
AF MIAC, n (%)	6 (55%)	1 (6%)	0.10
Spontaneous preterm birth < 7d following AC, n (%)	6 (55%)	0	<0.001

Median (range).

Inflammation, MMP-8 > 41.5 ng/mL.

AF, amniotic fluid.

AC, amniocentesis.

MIAC, microbial invasion of the amniotic cavity.

MMP-8, matrix metalloproteinase -8.