title: Pregnancy-related mortality among women with multifetal pregnancies.
abstract: OBJECTIVE
  To examine the relative risk of pregnancy-related mortality between multifetal pregnancies and singleton pregnancies.
  
  
  METHODS
  We used data from the Centers for Disease Control and Prevention's Pregnancy Mortality Surveillance System to examine singleton and multifetal pregnancy-related deaths among women with a live birth or fetal death from 1979-2000. The plurality-specific (singleton or multifetal) pregnancy-based mortality ratio was defined as the number of pregnancy-related deaths per 100,000 pregnancies with a live birth. We analyzed the risk of death due to pregnancy for singleton and multifetal pregnancies by age, race, education, marital status, and cause of death.
  
  
  RESULTS
  Of 4,992 pregnancy-related deaths in 1979-2000, 4.2% (209 deaths) were among women with multifetal pregnancies. The risk of pregnancy death among women with twin and higher-order pregnancies was 3.6 times that of women with singleton pregnancies (20.8 compared with 5.8). The leading causes of death were similar for women with singleton pregnancies and women with multifetal pregnancies: embolism, hypertensive complications of pregnancy, hemorrhage, and infection.
  
  
  CONCLUSIONS
  Women with multifetal pregnancies have a significantly higher risk of pregnancy-related death than their counterparts with singleton pregnancies; this holds true for all women regardless of age, race, marital status, and level of education.
  
  
  METHODS
  II-2.
authors.affiliation: Office of Analysis and Epidemiology, National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, Maryland 20782, USA. anm3@cdc.gov
authors.forename: Andrea P
authors.initials: AP
authors.lastname: MacKay
authors.forename: Cynthia J
authors.initials: CJ
authors.lastname: Berg
authors.forename: Jeffrey C
authors.initials: JC
authors.lastname: King
authors.forename: Catherine
authors.initials: C
authors.lastname: Duran
authors.forename: Jeani
authors.initials: J
authors.lastname: Chang
mesh_terms: D002487:Centers for Disease Control and Prevention, U.S.; D005260:Female; D005313:Fetal Death; D006801:Humans; D050498:Live Birth; D011159:Population Surveillance; D011247:Pregnancy; D011248:Pregnancy Complications / Q000401:mortality*; D011256:Pregnancy Outcome; D011272:Pregnancy, Multiple / Q000706:statistics & numerical data*; D012307:Risk Factors; D014481:United States / Q000453:epidemiology