Table 2.
Multilevel Model of Likelihood of Use
| Variable | b | OR | SE | p-value | 95% CI |
|---|---|---|---|---|---|
| Within Persons | |||||
| Use plans | −0.22 | 0.80 | 0.05 | <.001 | [−.31, −.13] |
| Negative affect | −0.02 | 0.98 | 0.02 | .402 | [−.06, .02] |
| Positive affect | 0.02 | 1.02 | 0.02 | .373 | [−.02, .06] |
| Craving | −0.01 | 0.99 | 0.01 | .207 | [−.04, .01] |
| Time with friends a | 0.28 | 1.32 | 0.07 | <.001 | [.14, .42] |
| Time in places a | 0.06 | 1.06 | 0.07 | .415 | [−.09, .21] |
| Time with cues a | 0.10 | 1.10 | 0.08 | .222 | [−.06, .25] |
| Time with marijuana available a | 0.03 | 1.03 | 0.07 | .649 | [−.11, .18] |
| Weekend | −0.10 | 0.90 | 0.05 | .038 | [−.18, −.01] |
| Between Persons | |||||
| Negative affect | −0.05 | 0.96 | 0.02 | .052 | [−.10, .01] |
| Positive affect | 0.01 | 1.02 | 0.02 | .864 | [−.04, .05] |
| Craving | 0.03 | 1.03 | 0.01 | .040 | [.01, .06] |
| Time with friends b | 0.60 | 1.82 | 0.14 | <.001 | [.32, .89] |
| Time in places b | −0.33 | 0.72 | 0.11 | .003 | [−.55, −.11] |
| Time with cues b | −0.34 | 0.71 | 0.13 | .008 | [−.59, −.09] |
| Time with marijuana available b | 0.42 | 1.52 | 0.13 | .001 | [.18, .66] |
| Age | 0.03 | 1.03 | 0.02 | .028 | [.01, .06] |
| Gender | 0.02 | 1.02 | 0.05 | .664 | [−.08, .13] |
Note: N = 85. Level 1 observations = 462 person-days. Values are unstandardized coefficients. Within persons = Day Level (L1). Between Persons = Person Level (L2). Gender (men = 0; women = 1). Bold face denotes significance.
a
Represents the proportion of prompts youth indicated they were in one of these contexts on that given day.
b
Average proportion of prompts that person spends in that type of context across all study days.