The other respiratory parameters (bronchopulmonary dysplasia (definition 36 weeks postmenstrual age), therapy with continuous positive airway pressure, therapy with diuretics, therapy with steroids) as well as neonatal parameters (birth weight, length at birth, head circumference at birth, year of birth, maximal C-reactive protein of infants in the first 72 postnatal hours, maximal Interleukin-6 of infants in the first 72 postnatal hours, clinical chorioamnionitis, histological chorioamnionitis) showed no correlation with PPROM duration (each p-value > 0.05). This evidence concerns the gene IL6 and preterm premature rupture of the membranes.