I assume it was just an unfortunate oversight, but the authors made
no reference to population based, sex-specific birth weight percentiles
using a similar large dataset (Beeby PJ, Bhuta T, and Taylor LK. New South
Wales population-based birthweight percentile charts. J Paediatr Child
Health 1996; 32: 512-518.) It is strange they should reference so many
older, inferior studies but not reference recent, similar studies.
Like theirs, ours used a similat method to "clean" the inevitable
data problems one sees with population data. The values for P50, P90 and
mean are remarkably similar, in contrast to the references they did cite
which were significantly different. Our centile charts are available for
download from our unit's website: http://www.cs.nsw.gov.au/rpa/neonatal
Philip J Beeby
Department of Neonatal Medicine
Royal Prince Alfred Hospital
Missenden Rd, Camperdown
NSW 2050, Australia