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Volume 9, Number 10—October 2003

Research

Escherichia coli O157 Exposure in Wyoming and Seattle: Serologic Evidence of Rural Risk

Jason P. Haack*, Srdjan Jelacic†, Thomas E. Besser‡, Edward Weinberger*†, Donald J. Kirk§, Garry L. McKee¶, Shannon M. Harrison¶, Karl J. Musgrave¶, Gayle Miller¶, Thomas H. Price*#, and Phillip I. Tarr*†Comments to Author 
Author affiliations: *University of Washington School of Medicine, Seattle, Washington; †Children’s Hospital and Regional Medical Center, Seattle, Washington; ‡Washington State University, Pullman, Washington; §Star Valley Hospital, Afton, Wyoming; ¶Wyoming Department of Health, Cheyenne, Wyoming; #Puget Sound Blood Center, Seattle, Washington

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Table 3

Age, gender, and enzyme immunoassay (EIA) value distribution in rural Wyoming communities, including the median and range of optical densities (OD) for EIA readings

Characteristics of populations Afton
(N=253) Alpine
(N=84) Thayne
(N=148)
Age (y)
 Mean (SD)
 Median (range) 56 (15)
56 (16–92) 55 (12)
56 (20–78) 61 (14)
63 (16–92)
Male: female 120:133 39:45 66:82
OD (EIA units)
 Least squares mean
 Median (range) 0.357
0.349 (0.192–1.115) 0.340
0.343 (0.185–0.550) 0.359
0.353 (0.230–0.643)
EIA, 80th percentile N+ (%)
EIA, 90th percentile N+ (%) 69 (27.3)
38 (15.0) 11 (13.1)
5 (6.0) 31 (20.9)
16 (10.8)

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