2007 National Roadside Survey of Alcohol and Drug Use by Drivers

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2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsComparisons across vehicle type (Table 92) showed drug prevalence rates among drivers ofpassenger vehicles, SUV, and van/minivans were not statistically different (p value = .12). Note,however, that motorcyclists had the greatest percentage of drug-positive results (p < .05), whilepickup drivers had the smallest prevalence (p < .05).Table 92. Drug Prevalence by Vehicle Type (Blood)Vehicle TypeN(Unweighted)% Drug Positive(Weighted)Passenger Vehicle 1,971 14.6%Pickup 401 9.3%SUV 586 11.6%Van & Minivan 250 16.2%Motorcycle 48 24.0%Overall 3,256 13.9%Driver Drug Use Prevalence by Drug Class Based on Blood ResultsIn this section of the report, we display driver drug use prevalence by class of drug, based onblood results. The classes of drugs tested for were antidepressants, marijuana, narcoticanalgesics,sedatives, stimulants, and other (see Tables 94-96).Drug ClassTwo percent of the blood-sampled drivers tested positive for more than one drug class (Table93).Table 93. Number and Distribution of Drug Classes (Blood)Number ofDrug ClassesN(Unweighted)%(Weighted)1 398 11.8%2+ 68 2.0%Negative 2,810 86.2%Overall 3,276 100.0%80
2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsIn comparing prevalence of drug classes by region (Table 94), marijuana was the most commondrug class across all of the regions (6.7%). However, drivers in the West region were less likelyto test positive for marijuana than in the other regions (p < .05).Table 94. Drug Classes Distribution by Region (Blood)Midwest%Northeast%South%West%Drug ClassN=971 N=584 N=862 N=859 N=3,276Antidepressants 0.7% 0.4% 1.3% 1.5% 1.1%Marijuana 7.9% 9.5% 6.0% 4.7% 6.7%Narcotic-Analgesics 1.1% 0.4% 1.4% 0.8% 0.9%Sedatives 0.9% 0.4% 1.6% 1.4% 1.1%Stimulants 2.1% 1.0% 1.5% 2.2% 1.9%Other 0.0% 0.0% 0.2% 0.5% 0.2%More than 1 Class 1.3% 2.9% 1.3% 2.4% 2.0%Overall Drug Positive 14.0% 14.5% 13.4% 13.5% 13.8%Negative 86.0% 85.5% 86.6% 86.5% 86.2%“More than 1 Class” – Drivers testing positive for more than one drug are only counted in this category.In this table, percentages are weighted.All%Comparison of drug class by gender (Table 95) revealed that male drivers were significantlymore likely to test positive for marijuana than female drivers (7.4% males vs. 5.6% females)(p < .05).Table 95. Drug Classes Distribution by Gender (Blood)Males%Females%Total%Drug ClassN=1,992 N=1,278 N=3,270Antidepressants 1.0% 1.2% 1.1%Marijuana 7.4% 5.6% 6.7%Narcotic-Analgesics 0.8% 1.0% 0.9%Sedatives 0.7% 1.8% 1.1%Stimulants 1.8% 2.0% 1.9%Other 0.4% 0.0% 0.2%More than 1 Class 2.4% 1.4% 2.0%Overall Drug Positive 14.5% 13.0% 13.9%Negative 85.5% 87.0% 86.1%In this table, percentages are weighted.“More than 1 Class” – Drivers testing positive for more than one drug are only counted in thiscategory.81
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DOT HS 811 249December 2009
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2007 National Roadside Survey of Alcohol and Drug Use by Drivers

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