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Reference birthweight range for multiple birth neonates in Japan.

Noriko Kato1

  • 1Department of Health Promotion and Research, National Institute of Public Health, 2-3-6 Minami, Wako-shi, Saitama, 351-0197 Japan. kato@niph.go.jp

BMC Pregnancy and Childbirth
|March 10, 2004
PubMed
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Establishing reference ranges for multiple birth neonate birthweights is crucial for assessing intrauterine growth. This study provides vital data for multiple births in Japan, considering factors like gestational age and birth order.

Area of Science:

  • Neonatalogy
  • Perinatology
  • Public Health

Background:

  • Accurate assessment of intrauterine growth requires established reference ranges for multiple birth neonates.
  • Existing data often lacks comprehensive analysis of factors influencing birthweight in twins, triplets, and quadruplets.

Purpose of the Study:

  • To establish reference ranges for birthweight in multiple births in Japan.
  • To analyze the impact of gestational age, sex, birth order, and maternal parity on birthweight in multiple neonates.

Main Methods:

  • Analysis of a large dataset of 32,232 twin pairs, 1894 triplet live births, and 206 quadruplet live births in Japan.
  • Inclusion criteria: multiple births identified by birthplace, parental age, gestational age, and birth date.
  • Statistical analysis to determine median birthweights and standard deviations, controlling for gestational age and other covariates.

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Main Results:

  • Male neonates were heavier than females, with a median difference of 0.05-0.1 kg.
  • Multiple birth neonates had lower birthweights than singletons, with differences increasing with gestational age.
  • Birth order influenced birthweight, with first-born twins being heavier; multiparous mothers had heavier twins.
  • Median birthweight decreased from twins to triplets to quadruplets.

Conclusions:

  • The study provides essential reference data for assessing the birthweight of multiple births in Japan.
  • Findings highlight the significant influence of gestational age, sex, birth order, and maternal parity on multiple birth neonate weights.
  • These results aid in the clinical evaluation of intrauterine growth and neonatal outcomes for multiple gestations.