Table 2.
Changes in ng/ml tetrahydrocannabinol (THC) in blood samples over time by alcohol change groups among a sample of drivers with alcohol ignition interlock devices (N = 189)
| Variable | Time 1 | Time 2 | Time 3 | |
|---|---|---|---|---|
| Alcohol decrease group (n = 46) | n positive for THC (%) | 3 (6.5%) | 11 (23.91%) | 17 (36.95%) |
| M (SD)a | 1.87 (10.21) | 8.87 (30.83) | 21.54 (62.72) | |
| Alcohol maintenance | n positive | |||
| group (n = 80) | for THC (%) | 6 (7.5%) | 8 (10.0%) | 11 (13.75%) |
| M (SD)a | 2.05 (7.99) | 2.98 (17.63) | 5.3 (31.59) | |
| Alcohol increase | n positive | |||
| group (n = 63) | for THC (%) | 4 (6.35%) | 7 (11.11%) | 8 (12.70%) |
| M (SD)a | 0.65 (3.78) | 1.49 (5.45) | 1.22 (4.42) |
a
Raw values of ng/ml of THC in blood samples.