title: [Study on height-weight indices in newborns of different gestational ages].
abstract: OBJECTIVE
  To establish height-weight indices in newborns of different gestational ages and to provide reference data for evaluation of intrauterine fetal growth.
  
  
  METHODS
  The weight, height, crown-rump length, head circumference, and chest circumference of 8 357 newborns were measured in Maternal and Child Health Care Hospital of Bao'an District of shenzhen between 2005 and 2006, with the method of fact-finding investigation with cross-sectional cluster sampling, to establish the height-weight indices in newborns of different gestational ages.
  
  
  RESULTS
  Five gender-specific height-weight indices (Quetelet Index, QI; Kaup Index, KI; Rohrer Index, RI; Livi Index, LI; Polock Index, PI) in newborns of different gestational ages (28-44 weeks of gestation) in three different groups (boys+girls, boys, and girls) were established in Shenzhen, China, and were expressed as mean gestational weeks±SD. The five indices above all increased with increasing gestational age, and the highest values appeared at 41-43 gestational weeks, suggesting that body density and enrichment degree increased constantly with increasing gestational age. Three indices (QI, KI and PI) were higher in boys than in girls (P<0.05).
  
  
  CONCLUSIONS
  With the increasing gestational age, the body density and enrichment degree of newborns increase, and the enrichment degree in boys is better than that in girls.
authors.affiliation: Department of Obstetrics and Gynecology, Maternal and Child Health Care Hospital, Bao'an District of Shenzhen, Shenzhen, Guangdong 518133, China. lhl1816@126.com.
authors.forename: Xiao-Yun
authors.initials: XY
authors.lastname: Huang
authors.forename: Hui-Long
authors.initials: HL
authors.lastname: Liu
authors.forename: Hui-Fen
authors.initials: HF
authors.lastname: Mai
authors.forename: Min
authors.initials: M
authors.lastname: Lei
authors.forename: You-Cong
authors.initials: YC
authors.lastname: Li
authors.forename: Feng-Lan
authors.initials: FL
authors.lastname: Ma
mesh_terms: D001827:Body Height; D001835:Body Weight; D003430:Cross-Sectional Studies; D005260:Female; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D012727:Sex Characteristics