Table 2.
Level-1 effects (main effects) on type of use occasion, number of cannabis uses, and peak subjective effects.
| SAM versus cannabis-only | Number of cannabis uses | Peak subjective effects | |||||||
|---|---|---|---|---|---|---|---|---|---|
| OR | 95% CI | p-value | IRR | 95% CI | p-value | OR | 95% CI | p-value | |
| Motives | |||||||||
| Coping | 0.80 | (0.51, 1.25) | .32 | 1.00 | (0.90, 1.12) | .98 | 0.69 | (0.52, 0.91) | <.01 |
| Social | 15.83 | (11.28, 22.20) | <.01 | 1.21 | (1.14, 1.28) | <.01 | 2.58 | (2.12, 3.13) | <.01 |
| Enhancement | 4.85 | (3.47, 6.80) | <.01 | 1.11 | (1.04, 1.19) | <.01 | 2.54 | (2.06, 3.15) | <.01 |
| Expansion | 0.29 | (0.19, 0.46) | <.01 | 1.06 | (0.97, 1.16) | .21 | 0.77 | (0.58, 1.01) | .06 |
| Social Context | |||||||||
| Alone | 0.21 | (0.15, 0.28) | <.01 | 0.93 | (0.88, 0.98) | .01 | 0.53 | (0.44, 0.63) | <.01 |
| With significant other | 2.64 | (1.61, 4.33) | <.01 | 1.12 | (1.01, 1.25) | .03 | 1.89 | (1.36, 2.64) | <.01 |
| With friends | 7.67 | (5.92, 9.92) | <.01 | 1.25 | (1.19, 1.32) | <.01 | 2.74 | (2.32, 3.23) | <.01 |
| Number of people intoxicated | 5.01 | (4.20, 6.20) | <.01 | 1.09 | (1.07, 1.12) | <.01 | 2.42 | (2.20, 2.65) | <.01 |
| Number of people using cannabis | 1.76 | (1.64, 1.89) | <.01 | 1.06 | (1.02, 1.11) | <.01 | 1.40 | (1.35, 1.46) | <.01 |
| Physical Context | |||||||||
| At home | 0.40 | (0.30, 0.52) | <.01 | 0.97 | (0.91, 1.03) | .28 | 0.79 | (0.66, 0.96) | .02 |
| At friend’s place | 4.02 | (2.98, 5.42) | <.01 | 1.18 | (1.11, 1.25) | <.01 | 2.07 | (1.68, 2.55) | <.01 |
Note. N=315. OR = odds ratio; IRR = incidence rate ratio. Each motive and context was estimated in a separate model. All models adjusted for Level-2 (day-level) and Level-3 (person-level) aggregates of each predictor, as well as age (age 21+ vs. not), school (School A, School B vs. School C [ref]), sex (male vs. female [ref]), race (white vs. non-white [ref]), ethnicity (Hispanic vs. non-Hispanic [ref]), wave (daily phase burst two vs. one [ref]), weekend (vs. weekday [ref]), any other drug use (yes vs. no [ref]) on a given survey, and any nicotine use (yes vs. no [ref]) on a given survey. Null models were conducted for each outcome to determine the intraclass correlation coefficients (ICC) at Level-2 and Level-3 for each outcome: SAM vs. cannabis (ICCLevel-2 = .49, ICCLevel-3 = .24), cannabis consumption (ICCLevel-2 = .49, ICCLevel-3 = .24), and peak subjective effects (ICCLevel-2 = .88, ICCLevel-3 = .69).