Amniotic fluid matrix metalloproteinase-8 concentrations according to gestational age at amniocentesis (i.e., −25.9 weeks, 26.0–33.9 weeks, and 34.0–36.9 weeks) in women with intra-amniotic infection by Ureaplasma spp. (median: 714.6 ng/mL, interquartile range [IQR]: 165.8–2681.2 ng/mL vs. median: 157.7 ng/mL, IQR: 24.9–870.8 ng/mL vs. median: 24.0 ng/mL, IQR: 1.8–272.3 ng/mL; P=.002 by Kruskal-Wallis analysis).