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 110. Nighttime Drug Prevalence by Time of Day (Oral Fluid and/or Blood)Time of DayN(Unweighted)% Drug Positive(Weighted)Daytime NA NANighttime 5,910 16.3%When we examined drug prevalence by time of day (Table 111), we found that late-night(Sessions 3 and 5) drivers were significantly more likely to be drug positive (19.1% and 18.3%respectively) than Friday and Saturday earlier in the night (Sessions 2 and 4) drivers (15.4% and15.2% respectively) (p < .01).Table 111. Drug Prevalence by Session (Oral Fluid and/or Blood)SessionN(Unweighted)% Drug Positive(Weighted)2: Friday, 10:00 p.m. – Midnight 1,618 15.4%3: Friday, 1:00 a.m. – 3:00 a.m. 1,313 19.1%4: Saturday, 10:00 p.m. – Midnight 1,695 15.2%5: Saturday, 1:00 a.m. – 3:00 a.m. 1,284 18.3%Overall 5,910 16.3%Comparison of drug prevalence by region (Table 112) showed that the Northeast region had thegreatest percentage of drug-positive findings, at 18.3 percent. However, this difference was notstatistically significant. Thus, no clear pattern by region emerged.Table 112. Drug Prevalence by Region (Oral Fluid and/or Blood)RegionN(Unweighted)% Drug Positive(Weighted)Midwest 1,708 16.9%Northeast 1,119 18.3%South 1,566 16.3%West 1,517 15.0%Overall 5,910 16.3%Examining drug prevalence by gender (Table 113) revealed that male drivers were significantlymore likely to be drug-positive than female drivers (18.0% male vs. 13.8% female) (p < .01).90
2007 National Roadside Survey of Alcohol and Drug Use by Drivers: Drug ResultsTable 113. Drug Prevalence by Gender (Oral Fluid and/or Blood)GenderN(Unweighted)% Drug Positive(Weighted)Males 3,634 18.0%Females 2,262 13.8%Overall 5,896 16.4%Comparison of drug prevalence by age (Table 114) indicated that drivers aged 16-44 showedstatistically similar drug prevalence (i.e., no statistical difference among these age groups).Conversely, drivers aged 45-64 and 65+ were significantly less likely to be drug-positive thandrivers aged 16-44 (p < .01).Table 114. Drug Prevalence by Age (Oral Fluid and/or Blood)AgeN(Unweighted)% Drug Positive(Weighted)16-20 974 18.8%21-34 2,451 18.2%35-44 1,046 17.0%45-64 1,225 12.1%65+ 148 4.0%Overall Nighttime 5,844 16.5%When examining drug prevalence by age and gender (Table 115), we found that drug prevalenceamong male drivers in the age categories 16-20 and 21-34 years was significantly higher thantheir same-aged female counterparts (p < .01). Drug prevalence among male drivers in the agecategory 35-44 years was also significantly higher than their same-aged female counterparts(p < .05). However, drug prevalence among female drivers aged 45-64 (15.4%) was significantlyhigher than male drivers of the same age group (10.0%) (p < .01).91
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2007 National Roadside Survey of Alcohol and Drug Use by Drivers

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