Table 3.
Quasi-Poisson regression models of marijuana use patterns among those reporting 30-day marijuana-only use vs. alcohol and marijuana simultaneous use.
| Descriptive Statistics | Model Results (0 = marijuana only; 1 = simultaneous use) | |||||||
|---|---|---|---|---|---|---|---|---|
| Marijuana only (n = 169) | Simultaneous use (n = 950) | CIs | ||||||
| M | SD | M | SD | Estimate | OR | 0.5% | 99.5% | |
| Marijuana Use Indicators | ||||||||
| Age of First Use | 16.40 | 2.03 | 16.11 | 2.00 | −0.02 | 0.98 | 0.95 | 1.00 |
| Use Frequency Last 30 Days | 12.70 | 11.41 | 12.93 | 10.86 | 0.03 | 1.03 | 0.86 | 1.24 |
| Typical Quantity (grams) | 7.52 | 11.51 | 7.60 | 10.78 | 0.03 | 1.03 | 0.74 | 1.46 |
| Typical Frequency | 7.93 | 8.84 | 7.53 | 7.96 | −0.05 | 0.95 | 0.75 | 1.22 |
| Best Friend Typical Frequency | 4.72 | 2.23 | 4.73 | 2.15 | 0.00 | 1.00 | 0.91 | 1.10 |
| Best Friend Typical Quantity (grams) | 3.97 | 5.38 | 3.45 | 4.65 | −0.15 | 0.86 | 0.65 | 1.17 |
| Type of Product | ||||||||
| Plant | 68.45 | 39.72 | 67.96 | 36.08 | −0.01 | 0.99 | 0.88 | 1.11 |
| Edibles | 10.92 | 25.00 | 10.71 | 22.21 | −0.01 | 0.99 | 0.64 | 1.60 |
| Concentrates | 15.18 | 29.76 | 17.89 | 29.83 | 0.16 | 1.18 | 0.81 | 1.77 |
| Other | 5.45 | 21.83 | 3.43 | 16.67 | −0.41 | 0.66 | 0.29 | 1.75 |
| Methods of Consumptions | ||||||||
| Smoked in joint/blunt without tobacco | 26.54 | 35.50 | 33.46 | 35.63 | 0.23 | 1.26 | 0.98 | 1.65 |
| Smoked in joint/blunt with tobacco | 12.32 | 27.53 | 8.06 | 21.14 | −0.43 | 0.65 | 0.41 | 1.09 |
| Smoked in bong/water pipe without tobacco | 29.74 | 38.82 | 31.03 | 35.50 | 0.03 | 1.03 | 0.80 | 1.34 |
| Smoked in bong/water pipe with tobacco | 4.94 | 18.82 | 3.62 | 13.79 | −0.30 | 0.74 | 0.36 | 1.67 |
| Eaten/cooked | 9.04 | 24.03 | 8.05 | 20.47 | −0.09 | 0.91 | 0.55 | 1.61 |
| Used in a vaporizer | 17.42 | 33.21 | 15.78 | 29.46 | −0.08 | 0.92 | 0.63 | 1.39 |
| Consumption Location | ||||||||
| At my home | 47.98 | 42.42 | 42.91 | 39.19 | −0.14 | 0.87 | 0.72 | 1.05 |
| At a friend’s home | 25.23 | 36.09 | 31.67 | 35.20 | 0.20 | 1.23 | 0.94 | 1.62 |
| At a stranger’s home | 1.19 | 8.73 | 1.42 | 7.97 | 0.25 | 1.29 | 0.40 | 6.58 |
| Outside | 10.46 | 24.46 | 9.87 | 22.89 | 0.05 | 1.06 | 0.66 | 1.78 |
| In a car | 10.73 | 23.23 | 6.11 | 15.55 | −0.56 | 0.57 | 0.37 | 0.90 |
| At a party | 2.15 | 7.58 | 6.63 | 16.12 | 1.13 | 3.09 | 1.49 | 7.84 |
| Other | 2.26 | 13.89 | 1.39 | 9.24 | −0.50 | 0.61 | 0.20 | 2.40 |
| Consumption Context | ||||||||
| Alone | 31.89 | 38.42 | 24.38 | 31.68 | −0.24 | 0.78 | 0.61 | 1.02 |
| With friends | 56.08 | 41.95 | 68.36 | 34.73 | 0.17 | 1.19 | 1.05 | 1.34 |
| With family | 8.65 | 23.24 | 4.81 | 16.33 | −0.50 | 0.61 | 0.34 | 1.14 |
| With people I don’t know | 0.98 | 7.87 | 1.30 | 6.31 | 0.28 | 1.32 | 0.44 | 5.97 |
| Other | 2.40 | 15.11 | 1.15 | 9.91 | −0.77 | 0.46 | 0.13 | 2.26 |
| Planned vs. Unplanned Use | ||||||||
| Planned Use | 64.54 | 41.40 | 71.00 | 37.28 | 0.09 | 1.10 | 0.97 | 1.24 |
| Consequences | ||||||||
| B-MACQ – Total Score (Range = 0 – 21) | 4.27 | 4.30 | 4.80 | 4.79 | 0.13 | 1.14 | 0.91 | 1.45 |
| CUDIT-R – Total Score (Range = 0 – 40) | 9.85 | 7.48 | 9.59 | 6.87 | −0.02 | 0.98 | 0.84 | 1.15 |
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.