Fig. 2
From: Positive drug test trends in fatally-injured drivers in the United States from 2007 to 2017
Trend in yearly prevalence in positive drug test among drivers who died within 1 h of crashing, by race. Cochran–Armitage tests were used to assess the statistical significance of changes in the percentage of drug involvement in fatally-injured drivers over time (White: Z = 23.5,p < 0.001;Black: Z = 11.6,p < 0.001;Hispanic: Z = 8.0,p < 0.001;Other: Z = 2.7,p < 0.01)