2007 National Roadside Survey of Alcohol and Drug Use by Drivers

2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsTime ofDayDaytimeTable 5. Drug Classes by Time of Day and Region (Oral Fluid)Drug ClassMidwest%Northeast%South%West%N=546 N=379 N=472 N=453 N=1,850Antidepressants 0.4% 0.6% 0.5% 0.5% 0.5%Marijuana 3.4% 3.0% 5.5% 4.0% 3.9%Narcotic-Analgesics 2.7% 2.1% 1.3% 0.6% 1.6%Sedatives 1.9% 2.6% 2.1% 0.7% 1.6%Stimulants 0.8% 1.7% 2.2% 2.0% 1.6%Other 0.0% 1.3% 0.0% 0.0% 0.2%More than 1 Class 2.2% 1.0% 1.4% 1.2% 1.5%Overall Drug Positive Daytime 11.5% 12.5% 13.1% 8.9% 11.0%Negative 88.5% 87.5% 86.9% 91.1% 89.0%N=1,694 N=1,111 N=1,559 N=1,505 N=5,869Antidepressants 0.5% 0.2% 0.0% 0.1% 0.2%Marijuana 7.7% 7.6% 6.3% 4.1% 6.1%Narcotic-Analgesics 1.0% 2.8% 1.2% 1.8% 1.6%NighttimeSedatives 1.1% 0.2% 0.7% 0.4% 0.6%Stimulants 3.0% 2.3% 2.7% 4.0% 3.2%Other 0.2% 0.0% 0.1% 0.5% 0.3%More than 1 Class 1.6% 4.1% 2.9% 2.0% 2.3%Overall Drug Positive Nighttime 15.0% 17.3% 14.0% 12.9% 14.4%Negative 85.0% 82.7% 86.0% 87.1% 85.6%In this table, percentages are weighted.“More than 1 Class” – Drivers testing positive for more than one drug class are counted only in this category.All%Further, as indicated in Table 6, comparison of number of drug classes by time of day indicatedthat nighttime drivers (2.3%) were significantly more likely to test positive for more than onedrug class than daytime drivers (1.5%) (p < .01).Table 6. Number and Distribution of Drug Classes by Time of Day (Oral Fluid)Time of DayDaytimeNighttimeNumber ofDrug ClassesN(Unweighted)%(Weighted)1 206 9.5%2+ 40 1.5%Negative 1,604 89.0%Overall Daytime 1,850 100.0%1 680 12.1%2+ 156 2.3%Negative 5,033 85.6%Overall Nighttime 5,869 100.0%6