not significant, the non-compliant group was slightly higher than the compliant group in terms of the marijuana dependence score [mean = 5.8, standard deviation (STD) = 2.4 versus mean = 5.2, STD = 2.3] and slightly lower in quantity (mean = 50.5, STD = 36.6; mean = 56.5, STD = 31.1) and frequency of use (mean = 25.7, STD = 5.5; mean = 27.7, STD = 3.9). The difference in frequency use approached significance (P = 0.06). Compliant participants demonstrated a mean decrease of urine THC–COOH by 68% between baseline and day 5 of abstinence (data not shown).
