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American Journal of Epidemiology Advance Access originally published online on April 24, 2009
American Journal of Epidemiology 2009 169(11):1406-1407; doi:10.1093/aje/kwp063
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American Journal of Epidemiology © The Author 2009. Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.

LETTERS TO THE EDITOR

THE AUTHORS REPLY

Maureen S. Durkin1, Matthew J. Maenner1, Christopher M. Cunniff2, Laura A. Schieve3 and Mark A. Albanese1

1 Department of Population Health Sciences, School of Medicine and Public Health, University of Wisconsin–Madison, Madison, WI 53726
2 Department of Pediatrics, College of Medicine, University of Arizona, Tucson, AZ 85724
3 National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA 30333

(e-mail: mdurkin@wisc.edu)

The first 10% of the full text of this article appears below.

We thank Olsen and Zhu for their observations (1). We have reanalyzed our data (2) in light of Olsen and Zhu's suggestion that parental age discrepancy may have confounded the association we reported between parental age at delivery and risk of autism. We found the following.

First, there were notable associations between advancing maternal and paternal age, on the one hand, and average . . . [Full Text of this Article]


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