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 ResultsDriver Drug Use Prevalence by Drug Class Based on Oral Fluid and/orBlood ResultsIn this section of the report, we display driver drug use prevalence by class of drug. The classesof drugs tested for were antidepressants, marijuana, narcotic-analgesics, sedatives, stimulants,and other (see Tables 17-18).Drug ClassAs indicated in Table 120, 13.5 percent of the drivers tested positive for one drug class and 2.8percent tested positive for more than one drug class.Table 120. Number and Distribution of Drug Classes (Oral Fluid and/or Blood)Number ofDrug ClassesN(Unweighted)%(Weighted)1 792 13.5%2+ 184 2.8%Negative 4,934 83.7%Overall 5,910 100.0%Further, drivers testing positive for only one drug class constituted about 83 percent of drugpositivedrivers (Table 121).Table 121. Number and Distribution of Drug Classes (Drug Positives Only) (Oral Fluid and/orBlood)Number ofDrug ClassesN(Unweighted)% Drug Positive(Weighted)1 792 82.8%2+ 184 17.2%Overall 976 100.0%94
2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsTable 122 presents distribution of drug classes by region. Generally, marijuana was the mostcommon drug class across all the regions (6.8%), followed by stimulants (3.2%). Drivers in theWest were less likely to test positive for marijuana than drivers from the other regions (p < .01).Table 122. Drug Classes Distribution by Region (Oral Fluid and/or Blood)Drug ClassMidwest%Northeast%South%West%All%N=1,708 N=1,119 N=1566 N=1,517 N=5,910Antidepressants 0.7% 0.4% 0.7% 0.7% 0.7%Marijuana 8.8% 7.8% 7.2% 4.7% 6.8%Narcotic-Analgesics 1.0% 2.9% 1.6% 1.6% 1.6%Sedatives 1.2% 0.3% 0.8% 0.8% 0.8%Stimulants 3.1% 1.8% 2.6% 4.2% 3.2%Other 0.2% 0.0% 0.1% 0.5% 0.3%More than 1 Class 1.8% 5.1% 3.2% 2.5% 2.8%Overall Drug Positive 16.9% 18.3% 16.3% 15.0% 16.3%Negative 83.1% 81.7% 83.7% 85.0% 83.7%“More than 1 Class” – Drivers testing positive for more than one drug are only counted in this category.In this table, percentages are weighted.As is shown in Table 123, males were significantly more likely to be positive for marijuana thanfemales (8.0% males vs. 5.0% females) (p < .01).Table 123. Drug Classes Distribution by Gender (Oral Fluid and/or Blood)Drug ClassMales%Females%Total%N=3,634 N=2,262 N=5,896Antidepressants 0.7% 0.7% 0.7%Marijuana 8.0% 5.0% 6.9%Narcotic-Analgesics 1.7% 1.5% 1.6%Sedatives 0.6% 1.2% 0.8%Stimulants 3.1% 3.5% 3.3%Other 0.3% 0.3% 0.3%More than 1 Class 3.5% 1.7% 2.8%Overall Drug Positive 18.0% 13.8% 16.4%Negative 82.0% 86.2% 83.6%“More than 1 Class” – Drivers testing positive for more than one drug are onlycounted in this category.In this table, percentages are weighted.When we examined drug class prevalence by age (Table 124), we found that drivers aged 16-20were more likely to use marijuana (12.0%) than drivers in the 21-34 age group (p < .05) and anyother age group (p < .01). The age group with the second highest prevalence of marijuana was21-34; the prevalence in this age group (9.2%) was also significantly higher than in older agegroups (p < .01).95
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Page 148: DOT HS 811 249December 2009
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2007 National Roadside Survey of Alcohol and Drug Use by Drivers

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