Abstract:Objective To establish the percentile curve of birth weight by gestational age for twins in Guangdong province. Methods By using GAMLSS method, birth weight percentile curves of twins with different genders were established by using birth certificate data from 2014 to 2016 of Guangdong Province. The following variables were extracted and analyzed:the sex of infants, gestational age, placental chorionicity, and birth weight. Results The average birth weight decreased from 2 447.6±3.0 g in 2014 to 2 403.1±2.9 g in 2016, and the preterm birth rate increased from 40.6% in 2014 to 45.6% in 2016. There was significant difference in the mean birth weight, preterm birth rate, and low birth weight rate between the dichorionic diamniotic twins (DCDA) and the monochrionic diamniotic twins (MCDA). The reference curves of birth weight were generated, and the corresponding reference values of the 3rd, 10th, 25th, 50th, 75th, 90th, and 95th percentiles were provided for infants delivered between 25 and 43 weeks of gestation for DCDA and MCDA, respectively. For the male of DCDA, the female of DCDA, the male of MCDA, and the female of MCDA, the fastest growth rate in birth weight occurred in 35, 34, 32, and 36 weeks, respectively, ranging from 197 to 208 g. Conclusion The standard curve of birth weight of twins with different gestational age is established for both DCMA and MCDA in Guangdong province, which can make the estimation of twins’ birth weight more accurate in this area, and will provide a regional reference for clinicians to evaluate the growth status of twins.
1 Alexander GR,Himes JH,Kaufman RB,et al.A United States national reference for fetal growth.Obstet Gynecol,1996,87:163-168. 2 中国15 城市新生儿体格发育科研协作组(410008).中国15城市不同胎龄男女新生儿出生体重值修正报告.实用儿科杂志,1992,7:306-307. 3 van Wely M,Twisk M,Mol BW,et al.Is twin pregnancy necessarily an adverse outcome of assisted reproductive technologies? Hum Reprod,2006,21:2736-2738. 4 孙路明,赵扬玉,段涛.中华医学会“双胎妊娠临床处理指南(第一部分):双胎妊娠孕期监护及处理(2015)”解读.中国实用妇科与产科杂志,2016,32:291-297. 5 Cole TJ,Stanojevic S,Stocks J,et al.Age- and size-related reference ranges:a case study of spirometry through childhood and adulthood.Stat Med,2009,28:880-898. 6 Cole TJ,Green PJ.Smoothing reference centile curves:the LMS method and penalized likelihood.Stat Med,1992,11:1305-1319. 7 Rigby RA,Stasinopoulos DM.Smooth centile curves for skew and kurtotic data modelled using the Box-Cox power exponential distribution.Stat Med,2004,23:3053-3076. 8 Rigby RA,Stasinopoulos DM.Generalized additive models for location,scale and shape.J Stat Softw,2010,54:507-554. 9 Smits J,Monden C.Twinning across the Developing World.Plos One,2011,6:e25239. 10 Li Z,Umstad MP,Hilder L,et al.Australian national birthweight percentiles by sex and gestational age for twins,2001-2010.BMC Pediatr,2015,15:148. 11 Kramer MS,Platt RW,Wen SW,et al.A new and improved population-based Canadian reference for birth weight for gestational age.Pediatrics,2001,108:E35. 12 Kato N.Reference birthweight range for multiple birth neonates in Japan.BMC Pregnancy Childbirth,2004,4:2. 13 Hu IJ,Hsieh CJ,Jeng SF,et al.Nationwide Twin Birth Weight Percentiles by Gestational Age in Taiwan.Pediatr Neonatol,2015,56:294-300. 14 Kato N,Matsuda T.Estimation of optimal birth weights and gestational ages for twin births in Japan.BMC Public Health,2006,6:45. 15 刘裕,何健荣,郭勇,等.生长曲线构建的不同方法比较.中国卫生统计,2015,32:571-575. 16 Cole TJ,Statnikov Y,Santhakumaran S,et al.Birth weight and longitudinal growth in infants born below 32 weeks' gestation:a UK population study.Arch Dis Child Fetal Neonatal Ed,2014,99:F34-40. 17 朱丽,张蓉,张淑莲,等.中国不同胎龄新生儿出生体重曲线研制.中华儿科杂志,2015,53:97-103. 18 Premkumar P,Antonisamy B,Mathews J,et al.Birth weight centiles by gestational age for twins born in south India.BMC Pregnancy Childbirth,2016,16:64. 19 Ananth CV,Vintzileos AM,Shen-Schwarz S,et al.Standards of birth weight in twin gestations stratified by placental chorionicity.Obstet Gynecol,1998,91:917-924. 20 Tobe RG,Mori R,Shinozuka N,et al.Birthweight discordance,risk factors and its impact on perinatal mortality among Japanese twins:data from a national project during 2001-2005.Twin Res Hum Genet,2010,13:490-494. 21 Oger AS,Robillard PY,Barau G,et al.Perinatal outcome of monochorionic and dichorionic twin gestations:a study of 775 pregnancies at Reunion Island.J Gynecol Obstet Biol Reprod (Paris),2013,42:655-661. 22 Loos RJ,Derom C,Derom R,et al.Determinants of birthweight and intrauterine growth in liveborn twins.Paediatr Perinat Epidemiol,2005,19:15-22. 23 Cooke RW.Conventional birth weight standards obscure fetal growth restriction in preterm infants.Arch Dis Child Fetal Neonatal Ed,2007,92:F189-192. 24 Nisbet D,Robinson H,Halliday J,et al.Australian Society of Ultrasound in Medicine (ASUM) Policy Statement on normal ultrasonic fetal measurements.Aust N Z J Obstet Gynaecol,2002,42:101-103.