[Risk factors of prematurity. A case control study].

Background: Prematurity is the most frequent cause of perinatal morbidity and mortality, and is responsible with 75% of neonantal deaths not related to congenital defects.

Objective: The aim of this study was to know risk factors that influence premature delivery in a third level attention in a Gyneco-Obstetric Unit.

Material And Methods: In a case-control study, was conducted an interview with 300 mothers who had their delivery at 28 and 36 gestational weeks in group of cases and 600 mothers from 37 to 41 weeks in controls, who assisted for attention from April to September 2011.