TABLE 2.
Characteristics of subjects in the three THC concentration groups.
| Characteristic | Placebo |
5.9% THC |
13.4% THC |
Test |
| (n = 11) | (n = 3–4) | (n = 8) | ||
| Age mean | 27.00 ± 5.81 | 24.00 ± 2.58 | 37.38 ± 11.99 | H = 6.172, df = 2, P = 0.046 |
| Median | 23.00 | 24.00a | 31.00a† | |
| Sex (M/F) (n) | 6/5 | 3/1 | 6/2 | FET = 1.061, P = 0.62 |
| Baseline mean | 16.65 ± 17.03 | 4.90 ± 4.93 | 20.44 ± 20.11 | H = 2.611, df = 2, P = 0.27 |
| THCCOOH median level | 6.10 | 3.10 | 13.20 | |
| Baseline mean | 1.53 ± 2.00 | 0.33 ± 0.65 | 1.50 ± 1.60 | H = 1.697 df = 2, P = 0.43 |
| THC median level | 0.70 | 0.00 | 1.10 | |
| Characterization of past Marijuana use (High, middle, low) (n) | 3/7/1 | 1/2/0 | 2/5/1 | FET = 1.176, P = 1.00 |
| CDS baseline score (mean) | −0.075 ± 0.685 | −0.478 ± 0.230 | 0.242 ± 0.518 | F = 1.722, df = 2.21, P = 0.21 |
Higher CDS scores indicate poorer driving performance. H = test statistic from Kruskal–Wallis analysis of variance. Parametric analysis of age, TCCOOH and baseline TCH levels shows similar results. F = analysis of variance test statistic. FET, fishers exact test. †Difference from placebo P = 0.056. aDifference between 5.9 and 13.4 group P = 0.023.