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American Journal of Epidemiology Advance Access originally published online on June 22, 2005
American Journal of Epidemiology 2005 162(2):139; doi:10.1093/aje/kwi171
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American Journal of Epidemiology Copyright © 2005 by the Johns Hopkins Bloomberg School of Public Health All rights reserved

ORIGINAL CONTRIBUTIONS

Westergaard et al. Respond to "Sibship Effects and a Call for a Comparative Disease Approach"

Tine Westergaard1, Klaus Rostgaard1, Jan Wohlfahrt1, Per Kragh Andersen2, Peter Aaby1 and Mads Melbye1

1 Division of Epidemiology Research, Danish Epidemiology Science Centre, Statens Serum Institut, Copenhagen, Denmark
2 Department of Biostatistics, University of Copenhagen, Copenhagen, Denmark

Correspondence to Dr. Tine Westergaard, Division of Epidemiology Research, Danish Epidemiology Science Centre, Statens Serum Institut, 5 Artillerivej, DK-2300 Copenhagen S, Denmark (e-mail: twe@ssi.dk).

Received for publication April 18, 2005. Accepted for publication April 20, 2005.

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We found increasing sibship size to be associated with a decreased risk of allergic rhinitis and asthma with allergic rhinitis but not with asthma without allergic rhinitis (1Go). However, by use of polytomous logistic regression, we found that the protective effect of having siblings on the risk of asthma with allergic . . . [Full Text of this Article]


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