title: Customized weight curves for Spanish fetuses and newborns.
abstract: OBJECTIVE
  To construct a model of customized birthweight curves for use in a Spanish population.
  
  
  METHODS
  Data of 20 331 newborns were used to construct a customized birthweight model. Multiple regression analysis was performed with newborn weight as the dependent variable and gestational age (GA), sex and maternal (M) weight, height, parity and ethnic origin as the independent variables. Using the new model, 27,507 newborns were classified as adequate for GA (AGA), large for GA (LGA) or small for GA (SGA). The results were compared with those of other customized and non-customized models.
  
  
  RESULTS
  The resulting formula for the calculation of optimal neonatal weight was: Optimum weight (g) = 3289.681 + 135.413*GA40-14.063*GA40(2)-0.838*GA40(3) + 113.889 (if multiparous) + 165.560 (if origin = Asia) + 161.550 (South America) + 67.927 (rest of Europe) +109.265 (North Africa) + 9.392*Maternal-Height + 4.856*Maternal-Weight-0.098*Maternal-Weight(2) + 0.001*Maternal-Weight(3) + 67.188*Sex + GA40*(6.890*Sex + 9.032 (If multiparous) +0.006*Maternal-Height(3) + 0.260*Maternal-Weight) + GA40(2) (-0.378*Maternal-Height - 0.008*Maternal-Height(2)) + GA40(3) (-0.032*Maternal-Height). Weight percentiles were obtained from standard data using optimum weight variation coefficient. Agreement between our customized model and other Spanish models was "good" (κ = 0.717 and κ = 0.736; p < 0.001).
  
  
  CONCLUSIONS
  Our model is comparable to other Spanish models, but offers the advantage of being customized, updated and freely available on the web. The 30.6% of infants classified as SGA using our model would be considered as AGA following a non-customized model.
authors.affiliation: Departamento de Pediatría, Obstetricia y Ginecología , Hospital Universitario de Canarias and.
authors.forename: Nieves Luisa
authors.initials: NL
authors.lastname: González González
authors.forename: Enrique
authors.initials: E
authors.lastname: González Dávila
authors.forename: Francisco
authors.initials: F
authors.lastname: Cabrera
authors.forename: Erika
authors.initials: E
authors.lastname: Padrón
authors.forename: José Ramon
authors.initials: JR
authors.lastname: Castro
authors.forename: José Angel
authors.initials: JA
authors.lastname: García Hernández
mesh_terms: D000328:Adult; D001724:Birth Weight; D001835:Body Weight / Q000208:ethnology; D001837:Body Weights and Measures / Q000592:standards / Q000706:statistics & numerical data; D005260:Female; D047109:Fetal Development; D020567:Fetal Weight / Q000208:ethnology; D005333:Fetus / Q000033:anatomy & histology; D057238:Growth Charts; D006801:Humans; D007231:Infant, Newborn / Q000254:growth & development*; D008297:Male; D011247:Pregnancy; D013030:Spain / Q000453:epidemiology; D055815:Young Adult
keywords: Birth weight; customized growth curves; fetal weight; large for gestational age; small for gestational age