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American Journal of Epidemiology Vol. 154, No. 4 : 387-389
Copyright © 2001 by The Johns Hopkins University School of Hygiene and Public Health

LETTERS TO THE EDITOR

RE: "MORTALITY REDUCTION WITH AIR BAG AND SEAT BELT USE IN HEAD-ON PASSENGER CAR COLLISIONS"

Peter Cummings and Noel S. Weiss

Harborview Injury Prevention and Research Center 325 Ninth Avenue Seattle, WA 98104
Department of Epidemiology School of Public Health and Community Medicine University of Washington Seattle, WA 98195


   INTRODUCTION
 
Crandall et al. (1Go) used a matched-pair case-control study design to estimate the effects of air bags and seat belts on the mortality of drivers involved in traffic crashes. The authors defined a case as a driver who died and a control as a driver who lived. The matched pairs were the drivers in two passenger cars that collided head-on in the United States. The authors claimed that they were able to "precisely estimate the protective effect of both air bags and seat belts" (1Go, p. 223). We believe that their study estimates may have been affected by two sources of bias.

First, the authors used conditional logistic regression to estimate the relative risk of death associated with exposure. Driver death in a traffic crash is rare; in 1998, only about 0.2 percent of drivers involved in crashes in the United States were killed (2Go). Odds ratios . . . [Full Text of this Article]


   REFERENCES
 
Cameron S. Crandall, David P. Sklar and Lenora M. Olson

Department of Emergency Medicine School of Medicine University of New Mexico Health Sciences Center Albuquerque, NM 87131-5246
Department of Pediatrics Intermountain Injury Control Research Center University of Utah Salt Lake City, UT 84108-1226


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 Am J EpidemiolHome page
P. Cummings, N. S. Weiss, C. S. Crandall, D. P. Sklar, and L. M. Olson
RE: "MORTALITY REDUCTION WITH AIR BAG AND SEAT BELT USE IN HEAD-ON PASSENGER CAR COLLISIONS"
Am. J. Epidemiol., August 15, 2001; 154(4): 387 - 389.
[Full Text] [PDF]