Table 1.

Participant demographics

CON (n = 20)MJ (n = 20)p-value
Sex (M/F)9 M/11 F9 M/11 FN/A
Age20.7 (1.9)21.3 (1.9)0.30
Years of education14.3 (3.4)12.6 (4.8)0.20
STAIa
    State28.9 (7.94)27.7 (7.38)0.65
    Trait29.8 (7.32)29.5 (5.56)0.89
HAM-Db0.80 (1.40) [range: 0–5]1.10 (1.37) [range: 0–5]0.50
TIPIc
    Extroversion10.9 (2.36)10.7 (2.13)0.78
    Agreeableness10.8 (2.47)10.7 (1.81)0.94
    Conscientiousness11.9 (2.08)11.7 (2.13)0.76
    Emotional stability10.5 (2.52)11.4 (2.64)0.27
    Openness12.1 (1.90)12.4 (1.61)0.57
Substance use
    Alcohol
        No. alcoholic drinks/week2.64 (2.38)5.09 (4.69)0.10
        AUDIT score3.30 (1.78)5.50 (2.21)0.05
    Cigarettes
        No. of occasional smokersd07N/A
        No. of daily smokers01N/A
    Marijuana
        No. days/week03.83 (2.36)N/A
        No. joints/week011.2 (9.61)N/A
        No. joints/occasion01.80 (0.77)N/A
        No. smoking occasions/day01.80 (0.70)N/A
        Age of onset (years)16.6 (2.13)N/A
        Duration of use (years)6.21 (3.43)N/A
  • All values are expressed in means and SDs. CON, controls; MJ, marijuana users.

  • aState Trait Anxiety Inventory Form (Spielberger et al., 1983).

  • bHamilton Depression Rating Scale (Hamilton, 1960).

  • cTen-Item Personality Inventory (Gosling et al., 2003).

  • dOccasional smokers reported from 1 cigarette/week to 1 cigarette every 3 months.