title: Placenta weight percentile curves for singleton deliveries.
abstract: OBJECTIVE
  To produce population-based, gender- and gestational-age-specific centile curves for placental weight.
  
  
  METHODS
  Population study.
  
  
  METHODS
  Medical Birth Registry of Norway.
  
  
  METHODS
  All singleton live births in Norway from 1 January 1999 to 31 December 2002.
  
  
  METHODS
  In a cohort of children born in Norway, placental weights and the ratio of the birthweight to the placental weight were analysed to produce percentile curves.
  
  
  METHODS
  Placental weight, birthweight-to-placental weight ratio.
  
  
  RESULTS
  Tables and figures are presented for placental percentiles curves according to gestational age and gender. Also, tables and figures are presented for the ratio of birthweight to placental weight. CONCLUSIONS To our knowledge, this is the first time that population percentile curves have been produced for placental weights and hence for the ratio of birthweight to placental weight. These percentile curves may act as a reference for other populations as well until population-specific curves can be produced.
authors.affiliation: Department of Paediatrics, University of Auckland, Auckland, New Zealand. j.thompson@auckland.ac.nz
authors.forename: J M D
authors.initials: JM
authors.lastname: Thompson
authors.forename: L M
authors.initials: LM
authors.lastname: Irgens
authors.forename: R
authors.initials: R
authors.lastname: Skjaerven
authors.forename: S
authors.initials: S
authors.lastname: Rasmussen
mesh_terms: D001724:Birth Weight / Q000502:physiology*; D015331:Cohort Studies; D005260:Female; D005865:Gestational Age; D006801:Humans; D009664:Norway / Q000453:epidemiology; D009929:Organ Size; D010920:Placenta / Q000033:anatomy & histology*; D011247:Pregnancy / Q000502:physiology*; D012016:Reference Values