title: [Chinese neonatal birth weight curve for different gestational age].
abstract: OBJECTIVE
  Since 1986, the reference of birth weight for gestational age has not been updated. The aim of this study was to set up Chinese neonatal network to investigate the current situation of birth weight in China, especially preterm birth weight, to develop the new reference for birth weight for gestational age and birth weight curve.
  
  
  METHODS
  A nationwide neonatology network was established in China. This survey was carried out in 63 hospitals of 23 provinces, municipalities and autonomous regions. We continuously collected the information of live births in participating hospitals during the study period of 2011-2014. Data describing birth weight and gestational age were collected prospectively. Newborn's birth weight was measured by electronic scale within 2 hours after birth when baby was undressed. The evaluation of gestational age was based on the combination of mother's last menstrual period, ultrasound in first trimester and gestational age estimation by gestational age scoring system.
  
  
  METHODS
  the growth curve was drawn by using LMSP method, which was conducted in GAMLSS 1.9-4 software package in R software 2.11.1.
  
  
  RESULTS
  A total of 159 334 newborn infants were enrolled in this study. There were 84 447 male and 74 907 female. The mean birth weight was (3 232 ± 555) g, the mean birth weight of male newborn was (3 271 ± 576) g, the mean weight of female newborn was (3 188 ± 528) g. The test of the variables' distribution suggested that the distribution of gestational age and birth weight did not fit the normal distribution, the optimal distribution for them was BCT distribution. The Q-Q plot test and worm plot test suggested that this curve fitted the distribution optimally. The male and female neonatal birth weight curve was developed using the same method.
  
  
  CONCLUSIONS
  Using GAMLSS method to establish nationwide neonatal birth weight curve, and the first time to update the birth weight reference in recent 28 years.
authors: Department of Neonatology, Children's Hospital of Fudan University, Shanghai 201102, China.
authors: Li
authors: L
authors: Zhu
authors: Rong
authors: R
authors: Zhang
authors: Shulian
authors: S
authors: Zhang
authors: Wenjing
authors: W
authors: Shi
authors: Weili
authors: W
authors: Yan
authors: Xiaoli
authors: X
authors: Wang
authors: Qin
authors: Q
authors: Lyu
authors: Ling
authors: L
authors: Liu
authors: Qin
authors: Q
authors: Zhou
authors: Quanfang
authors: Q
authors: Qiu
authors: Xiaoying
authors: X
authors: Li
authors: Haiying
authors: H
authors: He
authors: Jimei
authors: J
authors: Wang
authors: Ruichun
authors: R
authors: Li
authors: Jiarong
authors: J
authors: Lu
authors: Zhaoqing
authors: Z
authors: Yin
authors: Ping
authors: P
authors: Su
authors: Xinzhu
authors: X
authors: Lin
authors: Fang
authors: F
authors: Guo
authors: Hui
authors: H
authors: Zhang
authors: Shujun
authors: S
authors: Li
authors: Hua
authors: H
authors: Xin
authors: Yanqing
authors: Y
authors: Han
authors: Hongyun
authors: H
authors: Wang
authors: Dongmei
authors: D
authors: Chen
authors: Zhankui
authors: Z
authors: Li
authors: Huiqin
authors: H
authors: Wang
authors: Yinping
authors: Y
authors: Qiu
authors: Huayan
authors: H
authors: Liu
authors: Jie
authors: J
authors: Yang
authors: Xiaoli
authors: X
authors: Yang
authors: Mingxia
authors: M
authors: Li
authors: Wenjing
authors: W
authors: Li
authors: Shuping
authors: S
authors: Han
authors: Bei
authors: B
authors: Cao
authors: Bin
authors: B
authors: Yi
authors: Yihui
authors: Y
authors: Zhang
authors: Email: chen6010@163.com.
authors: Chao
authors: C
authors: Chen
mesh_terms: D001724:Birth Weight; D002681:China; D005260:Female; D005865:Gestational Age; D006801:Humans; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D008297:Male