Abstract
Aim: This study aimed to investigate the relationship between systemic immune inflammation (SII) and response indices (SIRI), which are new markers of systemic inflammation derived from immune cells, and preterm premature rupture of membranes (PPROM), as well as adverse pregnancy outcomes.
 Materials and Methods: The retrospective study included 75 singleton pregnancies complicated with PPROM between 24 and 34 gestational weeks and 75 healthy pregnant women who delivered at term (control group). Inflammation indices were calculated based on neutrophil (N), platelet (P), lymphocyte (L), and monocyte (M) counts as follows: The neutrophil-to-lymphocyte ratio (NLR) = N/L; the platelet-to-lymphocyte ratio (PLR) = P/L; SII = (N×P)/L; and SIRI = (N×M)/L.
 Results: The median NLR (4.8 vs. 3.5, p
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