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American Journal of Epidemiology Advance Access originally published online on December 7, 2005
American Journal of Epidemiology 2006 163(4):392-393; doi:10.1093/aje/kwj042
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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

RE: "PRETERM BIRTH: THE INTERACTION OF TRAFFIC-RELATED AIR POLLUTION WITH ECONOMIC HARDSHIP IN LOS ANGELES NEIGHBORHOODS"

Ken-ichi Shukunami, Koji Nishijima and Fumikazu Kotsuji

Department of Obstetrics and Gynecology, University of Fukui, Matsuoka-cho, Yoshida-gun, Fukui 910-1193, Japan

e-mail: forton{at}fmsrsa.fukui-med.ac.jp

We read with great interest the article by Ponce et al. (1Go), which described well the interaction effects of traffic-related air pollution and economic hardship on preterm birth. However, Ponce et al. discarded some birth weight data (<500 g and >5,000 g) as extreme values. Moreover, they excluded patients who had undergone preterm cesarean delivery from the subjects. Obstetric studies on preterm delivery should not discard lower extreme values, because extremely (or very) low birth weight is closely related to very preterm birth (2Go). The rate of cesarean section in preterm delivery is larger than that of term delivery (3Go). The study by Ponce et al. would have been better researched and more useful if the lower extreme values of birth weight data had been included in their study.

ACKNOWLEDGMENTS

Conflict of interest: none declared.

References

  1. Ponce NA, Hoggatt KJ, Wilhelm M, et al. Preterm birth: the interaction of traffic-related air pollution with economic hardship in Los Angeles neighborhoods. Am J Epidemiol 2005;162:140–8.[Abstract/Free Full Text]
  2. Knops NB, Sneeuw KC, Brand R, et al. Catch-up growth up to ten years of age in children born very preterm or with very low birth weight. BMC Pediatr 2005;5:26. (DOI: 10.1186/1471-2431-5-26).[CrossRef][Medline]
  3. Cunningham FG, Leveno KJ, Bloom SL, et al. Williams obstetrics. 22nd ed. New York, NY: McGraw-Hill, Inc, 2005.

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