United States Department of Transportation
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Edition:Interim report
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Abstract:The U.S. Department of Transportation, National Highway Traffic Safety Administration (NHTSA) has instituted a voluntary program to evaluate the proficiency of laboratories measuring the amount of alcohol in blood. In this report, data from that program are examined, and the variability of those measurements assessed. Differences between labs, between dates for the same lab, and between samples on the same data are quantified. Differences in overall bias for the six different periods (covering two years) are noted. A few of the roughly 120 labs participating were observed to perform considerably less well than the others. /Abstract from report summary page/
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