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Archives of Disease in Childhood 1998;79:126-130; doi:10.1136/adc.79.2.126
Copyright © 1998 BMJ Publishing Group Ltd & Royal College of Paediatrics and Child Health.
Arch Dis Child 1998;79:126-130 ( August )

Randomised controlled trial of brief neonatal exposure to cows' milk on the development of atopy

Marijke H de Jong,a Vera T M Scharp-van der Linden,a Rob C Aalberse,c Johannes Oosting,b Jan G P Tijssen,b Cornelis J de Groota

a Department of Paediatrics, Emma Children's Hospital, Academic Medical Center (AMC), University of Amsterdam, PO Box 22700, 1100 DE Amsterdam, Netherlands, b Department of Clinical Epidemiology and Biostatistics, Academic Medical Center, University of Amsterdam, c Central Laboratory of the Netherlands Blood Transfusion Service, Amsterdam, Netherlands

Correspondence to: Dr de Jong.


Accepted 9 March 1998

OBJECTIVE---To determine the effect of brief early exposure to cows' milk on atopy in the first 2 years of life.
DESIGN---Double blind, placebo controlled, randomised feeding intervention trial (Bokaal study).
SETTING---Dutch midwifery practices.
PARTICIPANTS---1533 breast fed neonates.
INTERVENTION---Exposure to cows' milk protein (n = 758) or a protein free placebo (n = 775) during the first 3 days of life.
MAIN OUTCOME MEASURES---Clinical atopic disease and any positive radioallergosorbent (RAST) tests at 1 year of age.
RESULTS---Atopic disease in the first year was found in 10.0% (cows' milk) v 9.3% (placebo) of the children, with a relative risk of 1.07; in the second year, atopic disease was found in 9.6% v 10.2%, respectively, with a relative risk of 0.94. Per protocol analysis showed similar results. Any RAST positive test was found in 9.4% (cows' milk) v 7.9% (placebo) of children, with a relative risk of 1.19. Stratified analysis for high family risk of allergy showed a doubled incidence of atopic disease but no effect from the intervention.
CONCLUSION---Early and brief exposure to cows' milk in breast fed children does not increase the risk of atopic disease in the first 2 years.

Keywords: atopy; breast feeding; cows' milk; Bokaal study; randomised controlled trial


© 1998 by Archives of Disease in Childhood

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