6. History of previous preterm birth Primary risk for a preterm delivery in multiparas is a history of previous preterm birth (relative risk [RR] 2.62) Mercer BM,Am J Obstet Gynecol. 1999;181:1261–1221 Evaluation of the literature shows that history of a previous preterm delivery is consistently the most important risk factor for subsequent preterm birth.
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11. How do we identify who is at Risk? Preterm Birth Risk Factors Cervical Length Fetal Fibronectin Symptoms of PTL