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 ResultsComparison of drug class by age (Table 96) showed that drivers 34 or younger were more likelyto test positive for marijuana than drives in other age groups (p < .01). Among drivers aged 16-34, drivers aged 16-20 years had the highest marijuana positives (15.2%). The prevalence ofnarcotic-analgesics was higher among the 16-20 and 35-44 year age group (1.3% and 1.7%) thanamong any other age group (p < .01).Table 96. Drug Classes Distribution by Age (Blood)Drug Class16-20%21-34%35-44%45-64%65+%Total%N=459 N=1,372 N=625 N=697 N=91 N=3,244Antidepressants 0.3% 0.6% 0.9% 2.8% 1.0% 1.1%Marijuana 15.2% 8.8% 3.1% 1.0% 0.0% 6.8%Narcotic-Analgesics 1.3% 0.7% 1.7% 0.4% 0.0% 0.9%Sedatives 0.0% 0.8% 1.0% 2.1% 4.8% 1.1%Stimulants 0.7% 1.8% 2.0% 2.7% 0.0% 1.8%Other 0.2% 0.4% 0.2% 0.0% 0.0% 0.2%More than 1 Class 2.7% 1.9% 1.8% 2.3% 0.1% 2.0%Overall Drug Positive 20.5% 15.2% 10.7% 11.2% 6.0% 14.0%Negative 79.5% 84.8% 89.3% 88.8% 94.0% 86.0%“More than 1 Class” – Drivers testing positive for more than one drug are only counted in this category.In this table, percentages are weighted.Driver Drug Use Prevalence by Drug Category Based on Blood ResultsIn this section of the report, we display drug use prevalence results from blood tests by drugcategory.About 9 percent of the nighttime drivers providing blood tested positive for drugs in the “Illegal”category (Table 97). Four percent were positive for “Medications,” and 0.7 percent were positivefor both “Illegal and Medications.”Table 97. Drug Categories Distribution (Blood)Drug CategoryN(Unweighted)%(Weighted)Illegal 267 9.1%Medications 169 4.0%Illegal & Medications 30 0.7%Negative 2,810 86.2%Overall 3,276 100.0%“Medications” includes prescription and over-the-counter drugs.82
2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsThe percentage of “Illegal” drug prevalence was slightly higher (p < .05) in the Midwest andNortheast than in the remaining regions (Table 98).RegionMidwestNortheastSouthWestTable 98. Drug Categories Distribution by Region (Blood)Drug CategoryN(Unweighted)%(Weighted)Illegal 81 10.2%Medications 52 3.2%Illegal & Medications 8 0.6%Negative 830 86.0%Overall 971 100.0%Illegal 57 11.0%Medications 26 2.7%Illegal & Medications 4 0.8%Negative 497 85.5%Overall 584 100.0%Illegal 56 7.6%Medications 51 4.9%Illegal & Medications 12 0.9%Negative 743 86.6%Overall 862 100.0%Illegal 73 8.2%Medications 40 4.9%Illegal & Medications 6 0.5%Negative 740 86.5%Overall 859 100.0%“Medications” includes prescription and over-the-counter drugs.When examining prevalence by drug category and gender (Table 99), we found that over 10percent of male drivers had positive results for “Illegal” drugs, as did about 7 percent of femaledrivers (p < .01). The difference in percentage of positive results for “Medications” betweenmale and female drivers was not statistically significant.83
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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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