Respiratory symptoms and duration of residence in immigrant teenagers living in Melbourne, Australia
C V E Powella, T M Nolanb, J B Carlinb, C M Bennettb, P D R Johnsonc
a Department of
Emergency Medicine, University of Melbourne, Royal Children's
Hospital, Melbourne, Parkville 3032, Victoria, Australia, b Clinical Epidemiology and Biostatistics
Unit, Correspondence to: Professor Nolan.
email: nolan{at}cryptic.rch.unimelb.edu.au
Accepted 21 April 1999
OBJECTIVE
Examination
of the relation between respiratory symptoms and time since arrival in
Australia in immigrant teenagers living in Melbourne.
DESIGNTwo
stage, stratified, cross sectional survey.
SETTINGHigh schools
(n = 51).
SUBJECTS9794 people
aged 13-19 years.
MAIN OUTCOME
MEASURESPrevalence of wheeze during a 12 month
period, region of birth, duration of residence in Australia.
RESULTSThe estimated
population 12 month period prevalence of wheeze was 18.9% (95%
confidence interval (CI), 18.0 to 19.9). In subjects born outside
Australia, residence for five to nine years in Australia was associated
with a 2.1-fold (CI, 1.1 to 4.0) increase in the odds of self reported
wheeze; after 10-14 years, this risk increased 3.4-fold (CI, 1.8 to
6.7). There was no difference in severity of wheeze, measured by
reported frequency of attacks, between Australian born and
non-Australian born subjects.
CONCLUSIONSThe
notion of a continued secular increase in the prevalence of wheezing is
not supported. There is a time dose effect on the prevalence of
symptoms in subjects born outside Australia and now living in
Melbourne, which is independent of age and country of birth.
Keywords:
wheezing;
asthma;
prevalence;
environmental
factors
© 1999 by Archives of Disease in Childhood
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