Table 2

 Characteristics of the DRIVE Study participants

Characteristicn (%)
AUDIT-C, Alcohol Use Disorders Identification Test Consumption sub-Scale.
*Question related to self harm: “In the past 12 months have you ever deliberately hurt yourself or done anything that you knew might have harmed you or even killed you?”
AUDIT-C score
    At risk7851 (39.3)
    Not at risk12 149 (60.8)
Kessler-10 score
    Low5822 (29.1)
    Moderate7664 (38.3)
    High4992 (24.9)
    Very high1535 (7.7)
Self-harm*
    No18 000 (92.1)
    Yes1544 (7.9)
Driven after drinking alcohol in the past 4 weeks
    Never18 574 (93.4)
    1–2 times1173 (5.9)
    ⩾3 times89 (0.5)
    Don’t know47 (0.2)
Driven after smoking marijuana in the past 4 weeks
    Never19 250 (96.8)
    1–2 times398 (2.0)
    ⩾3 times176 (0.9)
    Don’t know56 (0.3)
How often would you smoke marijuana?
    Never17 292 (86.1)
    ⩽1 times a month2098 (10.4)
    2–4 times a month400 (2.0)
    2–3 times a week121 (0.6)
    ⩾4 times a week176 (0.9)
How often do you take other drugs?
    Never18 681 (93.2)
    ⩽1 time a month1033 (5.2)
    2–4 times a month238 (1.2)
    2–3 times a week52 (0.3)
    4 times a week or more43 (0.2)