Connect
MJA
MJA

Australian national birthweight percentiles by gestational age

Christine L Roberts and Paul A L Lancaster
Med J Aust 1999; 170 (3): 114-118.
Published online: 16 February 2009

Summary

Objective: To develop national birthweight percentiles by gestational age for male and female singleton infants born in Australia, and to compare the birthweight percentiles of Indigenous and non-Indigenous infants.

Design and setting: Cross-sectional study of singleton live births to Australian-born mothers from 1991 to 1994.

Main outcome measures: Birthweight percentiles by gestational age.

Results: During 1991–1994 Australian-born women gave birth to 769 077 live singleton infants. Of these, 28 230 (3.7%) were reported as births to Aboriginal or Torres Strait Islander women. Birthweight was missing for 581 (0.1%) births and gestational age was missing for 3014 (0.4%). An additional 3283 (0.4%) births were excluded because the recorded birthweights were extreme outliers for their recorded gestational ages. Indigenous women were more likely to be recorded as giving birth preterm (< 37 weeks’ gestation) than non-Indigenous women (11.6% v. 5.4%) and were more likely to give birth to small-for-gestational-age infants at term. After 34 weeks’ gestation, the median birthweights of Indigenous infants were consistently lower than those of non-Indigenous infants. At 40 weeks’ gestation the difference in the median birthweights between these two groups was 160 g for males and 130 g for females.

Conclusions: We present recent birthweight percentiles by gestational age based on national data in Australia. These percentiles provide current Australian norms for clinicians and researchers, and can provide a baseline for monitoring Indigenous perinatal outcomes.

NB: This archival article was made available in Feb 2009 as it was considered of importance. For the full article, please refer to the PDF version.

Received 8 November 2024, accepted 8 November 2024

  • Christine L Roberts
  • Paul A L Lancaster



Correspondence: 

Author

remove_circle_outline Delete Author
add_circle_outline Add Author

Comment
Do you have any competing interests to declare? *

I/we agree to assign copyright to the Medical Journal of Australia and agree to the Conditions of publication *
I/we agree to the Terms of use of the Medical Journal of Australia *
Email me when people comment on this article

Online responses are no longer available. Please refer to our instructions for authors page for more information.