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Table 2 Yearly prevalence of drug test result among fatally-injured drivers who died within 1 h of crashing by year, 2007 to 2017

From: Positive drug test trends in fatally-injured drivers in the United States from 2007 to 2017

Death Year Full Sample Tested Positive Tested Negative Other*
n n (%) n (%) n (%)
2007 10,839 2239 20.70% 5786 53.40% 2814 26.00%
2008 9642 2218 23.00% 5186 53.80% 2238 23.20%
2009 8362 2078 24.90% 4297 51.40% 1987 23.80%
2010 8029 2087 26.00% 4359 54.30% 1583 19.70%
2011 7901 2214 28.00% 4094 51.80% 1593 20.20%
2012 8969 2642 29.50% 4345 48.40% 1982 22.10%
2013 8868 2669 30.10% 4146 46.80% 2053 23.20%
2014 8720 2791 32.00% 4029 46.20% 1900 21.80%
2015 9838 3185 32.40% 4477 45.50% 2176 22.10%
2016 10,533 3406 32.30% 4756 45.20% 2371 22.50%
2017 10,520 3227 30.70% 3909 37.20% 3384 32.20%
Cochran–Armitage test Z, P-value** Z = 26.3, p < .0001 Z = -29.3, p < .0001 Z = 6.7, p < .0001
  1. *The other group included fatally-injured drivers whose test results were unknown or not reported and drivers who were not given drug tests. **Cochran–Armitage tests were used to assess the statistical significance of changes in the percentage of drug involvement in fatally-injured drivers over time (p < 0.01)