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Table 3 Predictors of a positive THC test in survey reported non-users: Unadjusted and adjusted odds ratiosa

From: Marijuana use in U.S. teen drivers: a comparison of a road-side survey of reported use and fluid tests for tetrahydrocannabinol (THC)

  Unadjusted OR (95% CI) Multivariable Adjusted OR (95% CI)
Demographic Characteristics
 Age (yrs)
  16–17 Ref  
  18–19 1.84 (0.75, 4.47)  
 Gender
  Female Ref  
  Male 1.86 (0.89, 3.90)  
 Race/Ethnicity
  White, Non-Hispanic Ref  
  Black, Non-Hispanic 1.58 (0.69, 3.59)  
  Hispanic 0.41 (0.10, 1.78)  
 Region
  South Ref  
  Northeast 2.65 (0.88, 7.96)  
  Midwest 2.40 (0.93, 6.20)  
  West 1.09 (0.37, 3.23)  
 Education level
  Less than high school Ref  
  High school graduate 1.38 (0.62, 3.04)  
  College 0.81 (0.35, 1.89)  
  Other 1.60 (0.18, 14.0)  
 Vocational status
  Employed, full time 2.04 (0.98, 4.28)  
  Employed, part time Ref  
  Not employed, student 1.0 (0.36, 2.81)  
  Unemployed, not student 2.27 (0.61, 8.45)  
  Other 0.63 (0.14, 2.83)  
 Household income
 0 < $25,000 Ref  
  $25,001 < $50,000 0.78 (0.33, 1.82)  
  $51,001 < $75,000 0.82 (0.33, 2.06)  
  $75,001 or more 0.55 (0.23, 1.32)  
 Time of year
  June–August Ref Ref
  September–March 2.50 (1.09, 5.76) 3.04 (1.28, 7.24)
Substance use
 Tobacco use
  Beyond a year/Never Ref Ref
  Within a month/Year 1.07 (0.39, 2.94) 1.11 (0.40, 3.10)
  Past 24 h 2.65 (1.32, 5.31) 3.49 (1.67, 7.27)
 Number of alcoholic drinks consumed in an average week
  0 or less than once a week Ref  
  1–2 times 1.16 (0.39, 3.41)  
  3–4 times 3.55 (0.71, 17.74)  
 Self-reported age at first alcohol use (yrs)
  No use Ref  
   ≤ 15 2.39 (0.97, 5.91)  
  16–17 1.40 (0.58, 3.38)  
  18–19 0.86 (0.25, 2.96)  
 State Medical Marijuana Law (MML) characteristics
  States without MMLs 3.44 (1.03, 11.49) 3.67 (1.08, 12.46)
  States with MMLs & state-regulated dispensaries 4.17 (1.04, 16.71) 5.0 (1.20, 20.76)
  States with MMLs & additional leniency provisions Ref Ref
 Passengers (Y, N)
  Absent Ref Ref
  Present 2.22 (1.12, 4.38) 2.42 (1.20, 4.89)
  1. aNational Roadside Survey (NRS), 2013–2014