[Sociodemographic and obstetric factors associated with preterm birth].

Background: Preterm birth is the major cause of neonatal morbidity and mortality and is responsible for 75 to 90% of neonatal deaths unrelated to congenital malformations.

Objective: To evaluate preterm birth association with sociodemographic and obstetric risk factors.

Material And Method: A retrospective, comparative, longitudinal and observational study was carried out in which were analyzed all preterm births registries found in 2001-2006 period in the Civil Hospital of Culiacan, Sinaloa, México.