Table 2.

Pregnancy outcomes according to the presence or absence of IAI (defined as an elevated AF MMP-8 concentration≥23 ng/mL) in 220 patients with preterm labor and low AF WBC counts (<19 cells/mm³)

IAI, intra-amniotic inflammation; AF, amniotic fluid; MMP-8, matrix metalloproteinase-8; WBC, white blood cell; GA, gestational age; NS, not significant; Acute-HCA, acute histologic chorioamnionitis.

^a)Of 220 cases, 215 patients were included in this analysis, because the test of AF MMP-8 concentration was not performed in 5 cases due to the limited amount of the remaining AF; ^b)Of 215 cases with available AF MMP-8 results, 213 patients were included in this analysis, because AF culture result was not available in two cases; ^c)One hundred ten patients who underwent amniocentesis within 7 days of birth were included in this analysis to preserve a meaningful temporal relationship between the results of AF studies and those of placental pathologic examination.