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American Journal of Epidemiology Advance Access originally published online on September 8, 2005
American Journal of Epidemiology 2005 162(9):923; doi:10.1093/aje/kwi304
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American Journal of Epidemiology Copyright © 2005 by the Johns Hopkins Bloomberg School of Public Health All rights reserved; printed in U.S.A.

Letter to the Editor

THE AUTHORS REPLY

Debbie A. Lawlor, Shah Ebrahim, Margaret May and George Davey Smith

Department of Social Medicine, University of Bristol, Bristol BS8 2PR, United Kingdom

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

We are reassured that correspondents' views (1Go–3Go)—that exploratory factor analysis should be treated with caution—coincide with our position (4Go). We do not say that factor analysis can be used to determine whether a syndrome exists, as Hanley et al. (1Go) suggest, although it might be implied by the poorly worded section subtitle in our paper. Our starting point was to consider each of the important questions to be . . . [Full Text of this Article]


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