Table 2.
Fixed effects estimates for multilevel models predicting alcohol and marijuana use on SAM use days.
| Number of drinks | Intoxication | Hours high | How high | Grams of marijuana |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Predictor | RR | 95% CI | b | se | RR | 95% CI | b | se | b | se |
| Between person predictors | ||||||||||
| Intercept | 3.47*** | (3.00,4.00) | 1.43*** | 0.10 | 2.74*** | (2.28,3.30) | 1.87*** | 0.09 | 1.47* | 0.23 |
| Male (vs. females) | 1.16* | (1.02,1.31) | −0.02 | 0.08 | 1.35*** | (1.17,1.56) | 0.11 | 0.08 | 0.65** | 0.20 |
| Agea | 0.94** | (0.90,0.98) | −0.09*** | 0.03 | 1.00 | (0.94,1.05) | 0.01 | 0.02 | −0.15* | 0.07 |
| Four-year college (vs. other) | 0.98 | (0.84,1.14) | −0.06 | 0.11 | 0.95 | (0.76,1.20) | 0.14 | 0.11 | −0.68* | 0.32 |
| Race/ethnicity (ref.=White) | ||||||||||
| Hispanic | 1.00 | (0.85,1.17) | 0.11 | 0.11 | 1.00 | (0.82,1.22) | 0.32** | 0.11 | 0.31 | 0.27 |
| Asian | 0.82* | (0.69,0.98) | −0.18 | 0.13 | 0.82 | (0.65,1.03) | 0.00 | 0.11 | −0.08 | 0.36 |
| Other | 0.88 | (0.75,1.03) | −0.03 | 0.10 | 1.06 | (0.87,1.29) | 0.05 | 0.11 | 0.25 | 0.26 |
| Avg. cross-fadinga | 1.11** | (1.03,1.19) | 0.24*** | 0.05 | 1.04 | (0.95,1.15) | 0.08 | 0.05 | 0.19 | 0.11 |
| Avg. general enhancementa | 0.97 | (0.88,1.07) | 0.04 | 0.06 | 1.09 | (0.99,1.19) | 0.14** | 0.05 | −0.17 | 0.14 |
| Avg. general sociala | 1.10* | (1.02,1.18) | 0.09 | 0.05 | 0.94 | (0.85,1.04) | −0.01 | 0.06 | −0.21 | 0.13 |
| Avg. general copinga | 0.81*** | (0.72,0.91) | −0.13 | 0.07 | 1.23** | (1.07,1.41) | 0.26*** | 0.07 | 0.85*** | 0.17 |
| Avg. general conformitya | 1.00 | (0.92,1.10) | 0.04 | 0.06 | 0.88 | (0.75,1.03) | −0.25*** | 0.06 | −0.32 | 0.17 |
| Within person predictors | ||||||||||
| Burst 2 | 1.00 | (0.93,1.08) | 0.02 | 0.06 | 1.00 | (0.89,1.12) | −0.02 | 0.05 | −0.13 | 0.12 |
| Weekend | 1.17*** | (1.10,1.24) | 0.23*** | 0.05 | 1.00 | (0.93,1.08) | 0.09 | 0.05 | 0.08 | 0.08 |
| Day number within burst (0-13) | 1.01** | (1.00,1.02) | 0.02* | 0.01 | 0.99 | (0.98,1.00) | 0.01 | 0.01 | 0.02 | 0.01 |
| Cross-fadingb | 1.24*** | (1.18,1.31) | 0.36*** | 0.05 | 1.00 | (0.94,1.07) | 0.00 | 0.04 | 0.08 | 0.08 |
| General enhancementb | 1.06 | (1.00,1.12) | 0.09* | 0.04 | 1.10** | (1.03,1.18) | 0.18*** | 0.04 | 0.31*** | 0.08 |
| General socialb | 1.09*** | (1.04,1.14) | 0.13*** | 0.04 | 1.07* | (1.01,1.13) | 0.05 | 0.04 | 0.03 | 0.05 |
| General copingb | 0.89** | (0.81,0.97) | −0.13* | 0.06 | 1.01 | (0.90,1.13) | 0.09 | 0.05 | 0.16 | 0.11 |
| General conformityb | 0.98 | (0.92,1.05) | −0.01 | 0.06 | 0.90* | (0.83,0.99) | 0.02 | 0.05 | 0.04 | 0.10 |
a
Grand mean centered
b
Person mean centered
*
p<.05
**
p<.01
***
p<.001
Note. RR = rate ratio, b = unstandardized regression coefficient, se = standard error, Avg.= average, SAM = simultaneous alcohol and marijuana, SU = substance use, ref.= reference group, Hisp.= Hispanic