The study aim is to evaluate the placental histopathological characteristics and maternal risk factors in preterm and term births according to their weeks of gestation. We designed a prospective study involving a patient population (n = 355) composed of pregnant women who delivered preterm (n = 216) and term neonates (n = 139). The preterm births were divided into three groups as extremely (n = 22), moderate (n = 96) and late preterm (n = 98) births. The statistical analyses were performed using SPSS version 15 software. There was significant difference regarding maternal vascular underperfusion and inflammation in the extremely preterm group compared with the other groups (P = 0.001), but fetal vascular obstruction and villitis of unknown etiology were not found significantly different. According to our study results, the careful examination of the placenta of premature babies, particularly those of extremely preterm births, should be part of routine obstetrical management to determine the causes of preterm birth.
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