Table 2. Unconditional Growth Model of Marijuana Use.
| Fixed Effects | π | UCL | LCL | t | df | p value |
|---|---|---|---|---|---|---|
| Intercept | 7.30 | 9.01 | 5.59 | 8.41 | 141 | 0.000 |
| Linear | -3.53 | -1.86 | -5.20 | -4.13 | 141 | 0.000 |
| Quadratic | 1.08 | 1.73 | 0.43 | 3.26 | 141 | 0.002 |
| Cubic | -0.09 | -0.03 | -0.15 | -2.54 | 141 | 0.012 |
| π = the Level 1 coefficient of the fixed effect on the outcome |
| UCL and LCL = 95% upper and lower confidence limits |
| Random Effects | Variance Component | df | χ2 | p value |
|---|---|---|---|---|
| Intercept | 95.00 | 130 | 1081.93 | 0.000 |
| Linear | 69.26 | 130 | 407.96 | 0.000 |
| Quadratic | 9.29 | 130 | 344.97 | 0.000 |
| Cubic | 0.10 | 130 | 312.30 | 0.000 |
| Level 1 error | 13.60 |
| Reliability | Estimate |
|---|---|
| Intercept | 0.89 |
| Linear | 0.65 |
| Quadratic | 0.59 |
| Cubic | 0.55 |