| Variables | β | SE | F-value | Significance (p-value) |
| Alcohol | −0.126 | 0.048 | 6.823 | 0.009** |
| Tobacco | −0.050 | 0.079 | 0.405 | 0.525 |
| Marijuana | −0.025 | 0.061 | 0.167 | 0.683 |
| R2 | 0.021 | |||
| F | 3.558 | |||