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New Australian birthweight centiles.

Farmey A Joseph1, Jonathan A Hyett2,3, Philip J Schluter4,5

  • 1Royal Prince Alfred Hospital, Sydney, NSW.

The Medical Journal of Australia
|July 2, 2020
PubMed
Summary

New Australian birthweight charts provide more accurate assessments for small for gestational age babies by excluding intervention-initiated births and using recent data. These updated charts improve the diagnosis of intrauterine growth restriction.

Keywords:
Birth weightFetal monitoringFetomaternal medicineNeonatologyObstetricsPreterm birth

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Area of Science:

  • Obstetrics and Gynecology
  • Neonatal Health
  • Biostatistics

Background:

  • Accurate birthweight centile charts are crucial for identifying fetal growth abnormalities.
  • Previous Australian charts may underestimate intrauterine growth restriction due to the exclusion of intervention-initiated births.

Purpose of the Study:

  • To develop updated, population-based Australian birthweight centile charts.
  • To improve the accuracy of identifying small for gestational age (SGA) babies.
  • To incorporate recent Australian perinatal data and exclude pre-term deliveries by obstetric intervention.

Main Methods:

  • Retrospective observational study using Australian Institute of Health and Welfare National Perinatal Data Collection (2004-2013).
  • Included singleton births (23-42 weeks gestation) with spontaneous onset of labour.
  • Excluded births initiated by obstetric intervention to minimize bias.

Main Results:

  • Utilized data from 2,807,051 singleton live births, with 1,582,137 (56.4%) having spontaneous labour onset.
  • The 10th centile for pre-term births was higher in the new charts compared to previous Australian charts.
  • The updated charts reflect more recent population data and exclude intervention-influenced births.

Conclusions:

  • Existing birthweight charts may underestimate intrauterine growth restriction.
  • Excluding intervention-initiated births and using recent data creates more accurate centile curves.
  • These updated Australian birthweight charts can enhance the diagnosis of SGA babies.