Copyright © 2004 by the Johns Hopkins Bloomberg School of Public Health
LETTERS TO THE EDITOR |
TWO AUTHORS REPLY
1 Department of Epidemiology, School of Public Health and Community Medicine, University of Washington, Seattle, WA 98195
2 Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA 98109
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We thank Zheng (1) and Clementi et al. (2) for their comments regarding our study (3). We agree with Zheng that the relation between gravidity and spontaneous abortion likely results from heterogeneous risk and selective fertility (4). If women are likely to continue becoming pregnant until they achieve the number of living children they desire (