title: [Comparison between two growth curves for small for gestational age diagnosis].
abstract: OBJECTIVE
  It was to compare the use of two growth curves for the diagnosis of small-for-gestational-age (SGA) infants, having the 10th percentile as reference.
  
  
  METHODS
  In a retrospective study, data of 20,567 singleton live births from January 2003 to June 2014 were analyzed, and divided according to gestational age: (a) 23 to 26, (b) 26 to 29, (c) 29 to 32, (d) 32 to 35, (e) 35 to 38, (f) 38 to 41 and (g) >41 weeks. Data were paired and analyzed using the McNemar test, with the level of significance set at 0.05.
  
  
  RESULTS
  The curve designed by Alexander indicated a higher percentage of diagnosis of SGA than the curve constructed by Fenton for every category of gestational age up to 41 weeks, more markedly in the 32-35 week group (18.5%). Between 37 and 40 weeks of gestational age, Alexander's curve exceeded Fenton's curve in 9.1% of the cases in the diagnosis of SGA.
  
  
  CONCLUSIONS
  The Fenton curve provides a more accurate evaluation of an infant's growth since it is gender-specific and allows measurement of three parameters. It has also been constructed with newer data and more sophisticated statistical tools.
authors: Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo - USP, São Paulo, SP, Brasil.
authors: Fernanda Pipitone
authors: FP
authors: Rodrígues
authors: Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo - USP, São Paulo, SP, Brasil.
authors: Silvio
authors: S
authors: Martinelli
authors: Departamento de Obstetrícia e Ginecologia, Faculdade de Medicina, Universidade de São Paulo - USP, São Paulo, SP, Brasil.
authors: Roberto Eduardo
authors: RE
authors: Bittar
authors: Departamento de Obstetrícia e Ginecologia, Faculdade de Medicina, Universidade de São Paulo - USP, São Paulo, SP, Brasil.
authors: Rossana Pulcineli Vieira
authors: RP
authors: Francisco
authors: Departamento de Obstetrícia e Ginecologia, Faculdade de Medicina, Universidade de São Paulo - USP, São Paulo, SP, Brasil.
authors: Marcelo
authors: M
authors: Zugaib
mesh_terms: D005260:Female; D005865:Gestational Age; D057238:Growth Charts; D006801:Humans; D007231:Infant, Newborn; D007236:Infant, Small for Gestational Age / Q000254:growth & development*; D008297:Male; D012189:Retrospective Studies