Maternal and neonatal characteristics in the different subgroups.

MIAC: Microbial invasion of amniotic cavity. HCA: Histological chorioamnionitis. PPROM: Preterm prelabor rupture of membranes. CRP: C-reactive protein. WBC: White blood cells. Continuous variables were compared using a nonparametric Jonckheere-Terpstra test and presented as medians (range). Categorical variables were compared using linear-by-linear association Chi-square test and presented as numbers (%). Spearman partial correlation was performed to adjust by gestational at amniocentesis sampling (p*).