title: Clinical analysis of 828 cases of iatrogenic preterm births.
abstract: OBJECTIVE
  To investigate the incidence, causes and delivery methods of iatrogenic preterm births.
  
  
  METHODS
  A retrospective study was conducted to review a cohort of preterm birth records to learn the incidence, causes and delivery methods of 828 iatrogenic preterm births from January 2004 to June 2007. The chi-squared and two tailed Student's t-test were used for statistical analysis.
  
  
  RESULTS
  During the 3.5-year study period, the total incidence of iatrogenic preterm birth was 6.4%, accounting for 49.8% of the total recorded preterm births. Specifically, the proportion of iatrogenic preterm births to the total recorded preterm births in 2005 was 51.9%, the highest during the study. The top three etiologies of iatrogenic preterm birth were intrahepatic cholestasis of pregnancy, hemorrhage and hypertensive disorder complicating pregnancy. Among the preterm births studied, 62 pregnancies delivered prior to term were for no recorded indications. Seven hundred and twenty-nine iatrogenic preterm births underwent cesarean section.
  
  
  CONCLUSIONS
  Iatrogenic preterm birth has become the main reason for preterm births and no recorded indications have become one cause of it. Cesarean delivery was the main delivery method among iatrogenic preterm births. Obstetricians should choose the delivery method strictly.
authors.affiliation: Obstetrics and Gynaecology, Chengdu Women and Children Health Hospital, Chengdu, Sichuan Province, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Yang
authors.forename: Weiyue
authors.initials: W
authors.lastname: Zeng
mesh_terms: D000293:Adolescent; D000328:Adult; D002585:Cesarean Section / Q000706:statistics & numerical data; D002681:China / Q000453:epidemiology; D002780:Cholestasis, Intrahepatic / Q000628:therapy; D015331:Cohort Studies; D005260:Female; D006470:Hemorrhage / Q000628:therapy; D006785:Hospitals, University; D006801:Humans; D046110:Hypertension, Pregnancy-Induced / Q000628:therapy; D015994:Incidence; D007751:Labor, Induced / Q000706:statistics & numerical data; D011247:Pregnancy; D011248:Pregnancy Complications / Q000628:therapy; D011250:Pregnancy Complications, Hematologic / Q000628:therapy; D047928:Premature Birth / Q000453:epidemiology* / Q000209:etiology; D012189:Retrospective Studies; D055815:Young Adult