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a Department of
Paediatrics, Mercy Hospital for Women, Clarendon Street, East
Melbourne, Victoria 3002, Australia, b Clinical Epidemiology and
Biostatistics Unit, Murdoch Children's Research Institute, Royal
Children's Hospital and Department of Paediatrics, University of
Melbourne, Melbourne, Victoria 3052, Australia
Correspondence to: Dr Hacking, International Child Health Group, Department of Paediatrics, University of Oxford, John Radcliffe Hospital, Oxford, OX3 9DU, UK doug.hacking{at}imm.ox.ac.uk
Accepted 12 November 2000
OBJECTIVE
To determine
the effect of birth order on respiratory distress syndrome (RDS) in the
outcome of twins in a large premature population managed in a modern
neonatal intensive care unit.
METHODS
An historical
cohort study design was used to analyse the neonatal outcomes of 301 premature liveborn twin sibling pairs of between 23 and 31 weeks
gestation from the Australia and New Zealand Neonatal Network 1995 database.
RESULTS
Among the 56 twin sibling pairs who were discordant for RDS, the second twin was
affected in 41 cases (odds ratio (OR) 2.7, 95% confidence interval
(CI) 1.5 to 5.3). The excess risk of RDS in the second twin increased
with gestation and was statistically significant for twins above 29 weeks gestation (OR 4.4, 95% CI 1.6 to 15).
CONCLUSIONS
There is a
significant increased risk of RDS associated with being the second born
of premature twins, which appears to depend on gestation.
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