Table 4.
Quasi-Poisson regression models of marijuana use patterns among those reporting 30-day alcohol and marijuana dual use vs. alcohol and marijuana simultaneous use.
| Descriptive Statistics | Model Results (0 = dual use; 1 = simultaneous use) | |||||||
|---|---|---|---|---|---|---|---|---|
| Dual Use (n = 285) | Simultaneous use (n = 950) | CIs | ||||||
| M | SD | M | SD | Estimate | OR | 0.5% | 99.5% | |
| Marijuana Use Indicators | ||||||||
| Age of First Use | 16.78 | 5.43 | 16.11 | 2.00 | −0.04 | 0.96 | 0.93 | 0.99 |
| Use Frequency Last 30 Days | 6.94 | 8.59 | 12.93 | 10.86 | 0.62 | 1.85 | 1.54 | 2.25 |
| Typical Quantity (grams) | 3.31 | 6.39 | 7.60 | 10.78 | 0.84 | 2.31 | 1.62 | 3.42 |
| Typical Frequency ( | 3.69 | 4.92 | 7.53 | 7.96 | 0.71 | 2.04 | 1.59 | 2.67 |
| Best Friend Typical Frequency | 4.07 | 2.18 | 4.73 | 2.15 | 0.15 | 1.16 | 1.07 | 1.27 |
| Best Friend Typical Quantity (grams) | 2.68 | 4.74 | 3.45 | 4.65 | 0.25 | 1.29 | 0.98 | 1.72 |
| Type of Product | ||||||||
| Plant | 55.99 | 43.32 | 67.96 | 36.08 | 0.19 | 1.21 | 1.09 | 1.35 |
| Edibles | 20.19 | 34.54 | 10.71 | 22.21 | −0.64 | 0.53 | 0.39 | 0.71 |
| Concentrates | 17.07 | 32.03 | 17.89 | 29.83 | 0.07 | 1.07 | 0.80 | 1.46 |
| Other | 6.75 | 24.45 | 3.43 | 16.67 | −0.70 | 0.50 | 0.26 | 1.00 |
| Methods of Consumptions | ||||||||
| Smoked in joint/blunt without tobacco | 28.94 | 38.29 | 33.46 | 35.63 | 0.15 | 1.16 | 0.95 | 1.43 |
| Smoked in joint/blunt with tobacco | 5.86 | 19.83 | 8.06 | 21.14 | 0.31 | 1.36 | 0.83 | 2.38 |
| Smoked in bong/water pipe without tobacco | 25.27 | 36.65 | 31.03 | 35.50 | 0.20 | 1.22 | 0.98 | 1.54 |
| Smoked in bong/water pipe with tobacco | 3.09 | 14.59 | 3.62 | 13.79 | 0.15 | 1.16 | 0.58 | 2.56 |
| Eaten/cooked | 17.72 | 33.19 | 8.05 | 20.47 | −0.80 | 0.45 | 0.32 | 0.64 |
| Used in a vaporizer | 19.12 | 34.17 | 15.78 | 29.46 | −0.17 | 0.84 | 0.62 | 1.15 |
| Consumption Location | ||||||||
| At my home | 43.15 | 43.84 | 42.91 | 39.19 | −0.03 | 0.97 | 0.83 | 1.15 |
| At a friend’s home | 34.06 | 41.47 | 31.67 | 35.20 | −0.07 | 0.93 | 0.77 | 1.14 |
| At a stranger’s home | 0.51 | 3.82 | 1.42 | 7.97 | 1.07 | 2.91 | 0.84 | 18.54 |
| Outside | 9.10 | 24.52 | 9.87 | 22.89 | 0.11 | 1.12 | 0.76 | 1.76 |
| In a car | 7.22 | 20.37 | 6.11 | 15.55 | −0.15 | 0.87 | 0.57 | 1.34 |
| At a party | 2.95 | 11.48 | 6.63 | 16.12 | 0.83 | 2.29 | 1.33 | 4.32 |
| Other | 3.35 | 17.11 | 1.39 | 9.24 | −0.87 | 0.42 | 0.17 | 1.08 |
| Consumption Context | ||||||||
| Alone | 20.62 | 34.71 | 24.38 | 31.68 | 0.15 | 1.16 | 0.91 | 1.49 |
| With friends | 71.98 | 39.45 | 68.36 | 34.73 | −0.05 | 0.96 | 0.88 | 1.04 |
| With family | 5.53 | 20.98 | 4.81 | 16.33 | −0.18 | 0.83 | 0.48 | 1.54 |
| With people I don’t know | 0.16 | 1.22 | 1.30 | 6.31 | 2.11 | 8.24 | 1.83 | 127.67 |
| Other | 2.42 | 15.29 | 1.15 | 9.91 | −0.82 | 0.44 | 0.14 | 1.49 |
| Planned vs. Unplanned Use | ||||||||
| Planned Use | 67.58 | 41.50 | 71.00 | 37.28 | 0.05 | 1.05 | 0.95 | 1.16 |
| Consequences | ||||||||
| B-MACQ – Total Score (Range = 0 – 21) | 2.75 | 3.73 | 4.80 | 4.79 | 0.45 | 1.58 | 1.26 | 1.99 |
| CUDIT-R – Total Score (Range = 0 – 40) | 6.52 | 5.38 | 9.59 | 6.87 | 0.28 | 1.33 | 1.15 | 1.54 |
Note: Significant results are bolded and were determined via 99% CIs for the Odds Ratios that did not contain 1. Regression models controlled for age, sex at birth (0 = male, 1 = female), year in school, and COVID-19 school announcement (0 = survey taken prior to school in-person teaching closure; 1 = survey taken after school in-person teaching closure). For CUDIT-R and B-MACQ, typical marijuana quantity consumption was also added as a covariate. We calculated typical frequency of marijuana use by summing the total number of time blocks for which they reported using during the typical week (ranges: 0–42). Best friend frequency of use was assessed using a 7-point response scale (response options: 0 = never to 6 = daily or almost daily). For type of product used, ways of consumption, consumption location, consumption context, and planned use, we used a constant sum approach in which students had to calculate the percentage of the time they used marijuana in the various ways assessed (total had to equal 100%) during the past month. Scores on these variables represent an average percent of the time each method is used across all participants rather than number of participants endorsing each category.