title: New first-trimester crown-rump length equations from a French general population.
abstract: BACKGROUND
  The purpose of this study was to obtain precise knowledge of fetal biometric measurements, in particular crown-rump length (CRL). Our results have been carefully compared to equations found in the literature.
  
  
  METHODS
  Single-operator measurements of 2,123 spontaneous pregnancies from a general French population provided new statistical relationships between fetal age (FA) and CRL. Comparisons were made with measurements obtained from 402 in vitro fertilizations (IVFs) for which FA were known. Heteroskedastic and robust regressions were compared by cross-validation, and prediction errors were studied. All ultrasound measurements were taken during standard follow-ups of pregnancies, without any additional features.
  
  
  RESULTS
  From a cleaned subsample of 513 spontaneous pregnancies, we reported good modeling of first-term embryonic growth, with equations and predictions of standard deviations agreeing with objective datations for IVFs. Most precise CRL measurements were predicted for FA of 49 days.
  
  
  CONCLUSIONS
  Our results allow future detection of fetal growth abnormalities using Z-scores throughout the first trimester.
authors.affiliation: Centre de Radiologie et d'Imagerie Médicale, Lambersart, France. Marc@Constant.eu
authors.forename: Marc
authors.initials: M
authors.lastname: Constant
authors.forename: Viet Chi
authors.initials: VC
authors.lastname: Tran
authors.forename: Bernard
authors.initials: B
authors.lastname: Benoit
authors.forename: Francis
authors.initials: F
authors.lastname: Vasseur
mesh_terms: D000465:Algorithms; D018568:Crown-Rump Length; D005260:Female; D005307:Fertilization in Vitro / Q000009:adverse effects; D047109:Fetal Development; D005602:France; D005865:Gestational Age; D006801:Humans; D008954:Models, Biological; D011247:Pregnancy / Q000502:physiology*; D011261:Pregnancy Trimester, First; D012016:Reference Values; D015203:Reproducibility of Results; D016216:Ultrasonography, Prenatal