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 ResultsTable 38. Drug Prevalence by Time of Day and BAC (Percentages Calculated by Row) (Oral Fluid)BAC (g/dL)Time of DrugNBetweenDay Result (Unweighted) Zero Zero and .08 .08+Positive 246 98.2% 1.4% 0.3%Daytime Negative 1,599 99.2% 0.6% 0.2%Overall Daytime 1,845 99.1% 0.7% 0.2%Positive 836 80.5% 15.0% 4.5%Nighttime Negative 5,031 90.2% 8.1% 1.7%Overall Nighttime 5,867 88.8% 9.1% 2.1%In this table, percentages are weighted.Table 39. Drug Prevalence by Time of Day and BAC (Percentages Calculated by Column)(Oral Fluid)BAC (g/dL)Time of DrugBetweenDay ResultZero Zero and .08 .08+ AllN=1,822 N=18 N=5 N=1,845Daytime Positive 10.9% 22.2% 17.1% 11.0%Negative 89.1% 77.8% 82.9% 89.0%N=5,207 N=530 N=130 N=5,867Nighttime Positive 13.1% 23.9% 30.6% 14.4%Negative 86.9% 76.1% 69.4% 85.6%In this table, “Ns” are unweighted and percentages are weighted.Table 40 shows that, within the daytime sample, drug-positive drivers in the age groups 16-20and 21-34 had the greatest percentage of alcohol-positive results; however, it should be notedthat the sample size for the youngest group was only 11. Among nighttime drug-positiveparticipants, drivers aged 21-34 had the greatest percentage of alcohol positives (in both thecategories BAC between zero and .08, and BAC .08+) (p < .01). As noted earlier, the number ofyears within age categories is not equivalent.54
2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsTime ofDayDaytimeNighttimeTable 40. BAC Among Drug-Positive Drivers by Time of Day and Age (Oral Fluid)BAC (g/dL)AgeNBetween(Unweighted) Zero Zero and .08 .08+16-20 11 89.7% 0.0% 10.3%21-34 72 95.5% 4.5% 0.0%35-44 51 99.2% 0.8% 0.0%45-64 90 99.8% 0.2% 0.0%65+ 20 100.0% 0.0% 0.0%Overall Positive Daytime 244 98.2% 1.4% 0.3%16-20 143 86.8% 10.0% 3.2%21-34 392 75.0% 19.7% 5.3%35-44 150 87.8% 8.5% 3.7%45-64 141 81.0% 14.3% 4.7%65+ 9 83.6% 16.4% 0.0%Overall Positive Nighttime 835 80.4% 15.0% 4.5%In this table, percentages are weighted.Among both daytime and nighttime drivers, there were fewer alcohol-positive drivers amongdrug-positive drivers with 2+ classes of drugs than among those with one class of drug (Tables41 and 42); however, due to the small sample size, there was no statistical difference.Table 41. BAC Among Drug-Positive Drivers by Number of Drug Classes and Time of Day(Percentages Calculated by Column) (Oral Fluid)BAC (g/dL)Time of DayNumber of Drug NBetweenClasses (Unweighted) Zero Zero and .08 .08+1 206 86.0% 95.1% 100.0%Daytime2+ 40 14.0% 4.9% 0.0%Overall Daytime 246 100.0% 100.0% 100.0%1 680 83.4% 81.6% 96.3%Nighttime2+ 156 16.6% 18.4% 3.7%Overall Nighttime 836 100.0% 100.0% 100.0%In this table, percentages are weighted.55
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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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