title: Preece-Baines Model 1 to Estimate Height and Knee Height Growth in Boys and Girls From Merida, Mexico.
abstract: Height and body segments in children have differential pubertal growth characteristics. Lower leg length is a sensitive indicator of child's nutritional status.
  
  
  
  The purpose of this study was to estimate differential timing and tempo of height and knee height (KH) growth in 9- to 17-year-old boys (n = 475) and girls (n = 500) from Merida, Mexico.
  
  
  
  In this cross-sectional study, the Preece-Baines growth curves-model 1 (PB 1) was fitted to the anthropometric data for height and KH.
  
  
  
  Based on the PB 1 model, KH had earlier age at maximum increment than height in boys (height = 12.37 years, KH = 11.54 years) and girls (height = 11.01 years, KH = 10.93 years). Peak velocity of these 2 dimensions was different in both sexes (boys: height = 7.11 cm/yr, KH = 2.25 cm/yr; girls: height = 5.14 cm/yr, KH = 1.45 cm/yr). Differences ( P <.001) by sex were also observed for the estimated size at peak velocity and final size of height and KH.
  
  
  
  When compared to height, KH was shown to have earlier adolescent growth spurt and a smaller difference between final size and the size at maximum (peak) velocity indicating an earlier age for achieving adult size. Overall, the studied boys and girls had short estimated final size, an earlier age at maximum increment, and a lower peak velocity in height than urban Guatemalan peers, the only regional reference available.
authors.affiliation: 1 Department of Human Ecology, Centro de Investigación y de Estudios Avanzados (Cinvestav) del IPN, Cinvestav, Merida, Mexico.
authors.forename: Sudip Datta
authors.initials: SD
authors.lastname: Banik
authors.affiliation: 2 Center for Quantitative Medicine, Duke-NUS Medical School, Singapore.
authors.forename: Sedigheh Mirzaei
authors.initials: SM
authors.lastname: Salehabadi
authors.affiliation: 1 Department of Human Ecology, Centro de Investigación y de Estudios Avanzados (Cinvestav) del IPN, Cinvestav, Merida, Mexico.
authors.forename: Federico
authors.initials: F
authors.lastname: Dickinson
mesh_terms: D000293:Adolescent; D041923:Adolescent Development; D000367:Age Factors; D000465:Algorithms; D001827:Body Height; D001846:Bone Development; D002648:Child; D002657:Child Development; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007717:Knee; D008297:Male; D008800:Mexico; D008954:Models, Biological; D009752:Nutritional Status / Q000208:ethnology; D012574:Schools; D012727:Sex Characteristics; D013334:Students; D014504:Urban Health / Q000208:ethnology
keywords: adolescent growth spurt; final size; height; knee height