Table I.
Differences in Substance Use Variables by Alcohol–Marijuana and Alcohol-only Groups, and Race
| Alcohol Use Only | Alcohol – MJ Use | ||||
|---|---|---|---|---|---|
| Substance Use and Related Variables |
Mean (SD) | N | Mean (SD) | N | F |
| Cigarettes per day | |||||
| White | 0.24 (1.09) | 37 | 6.82 (8.69) | 38 | 23.62 (by MJ)* |
| Minority | 0.54 (2.08) | 26 | 1.55 (3.59) | 11 | 6.56 (by race) t |
| Total | 0.37 (1.57) | 63 | 5.63 (8.11) | 49 | 8.61 interaction)* |
| Days drinking per month | |||||
| White | 1.92 (2.65) | 38 | 4.26 (5.07) | 38 | 2.58 (by MJ) |
| Minority | 1.87 (4.15) | 26 | 1.64 (2.84) | 11 | 5.57 (by race) t |
| Total | 1.90 (3.31) | 64 | 3.67 (4.77) | 49 | 2.34 (interaction) |
| Days binge drinking per month | |||||
| White | 0.45 (0.28) | 38 | 2.90 (5.24) | 38 | 11.56 (by MJ)* |
| Minority | 1.15 (3.85) | 26 | 1.05 (1.15) | 11 | 1.32 (by race) |
| Total | 0.73 (2.46) | 64 | 2.48 (4.70) | 49 | 3.14 (interaction) |
| Number of drinks per sitting/last 3 months | |||||
| White | 4.92 (1.72) | 38 | 5.74 (1.64) | 38 | 9.03 (by MJ)* |
| Minority | 4.65 (1.74) | 26 | 6.00 (1.61) | 11 | 0.00 (by race) |
| Total | 4.81 (1.72) | 64 | 5.80 (1.62) | 49 | 0.54 (interaction) |
| Maximum number of drinks/last 3 months | |||||
| White | 7.90 (4.68) | 38 | 11.68 (6.18) | 38 | 4.83 (by MJ) t |
| Minority | 8.23 (6.54) | 26 | 9.64 (2.25) | 11 | 0.52 (by race) |
| Total | 8.03 (5.47) | 64 | 11.22 (5.59) | 49 | 1.02 (interaction) |
| Calculated BAC in PED | |||||
| White | 0.24 (.10) | 38 | 0.26 (.09) | 38 | 6.76 (by MJ) t |
| Minority | 0.21 (.09) | 26 | 0.29 (.08) | 11 | 0.06 (by race) |
| Total | 0.23 (.10) | 64 | 0.27 (.09) | 49 | 1.97 (interaction) |
| Number of times rode with impaired driver | |||||
| White | 0.63 (1.82) | 38 | 3.95 (7.80) | 38 | 6.18 (by MJ) t |
| Minority | 1.19 (2.99) | 26 | 1.18 (1.40) | 11 | 0.18 (by race) |
| Total | 0.86 (2.36) | 64 | 3.33 (6.97) | 49 | 2.51 (interaction) |
| Adolescent Drinking Inventory | |||||
| White | 10.79 (6.58) | 38 | 18.42 (11.82) | 38 | 4.65 (by MJ) t |
| Minority | 11.58 (8.97) | 26 | 12.55 (8.58) | 11 | 1.63 (by race) |
| Total | 11.11 (7.58) | 64 | 17.10 (11.40) | 49 | 2.79 (interaction) |
*
p < 0.006 (Bonferroni correction)
t
p < 0.05 (trend towards significance)