Table 2.
Fit statistics from 1 to 6-class models.
| Class | Likelihood | AIC | BIC | SSABIC | Entropy | p-Value (LMR-LRT) | Class description |
|---|---|---|---|---|---|---|---|
| 1 | −5974.22 | 11,964.45 | 12,008.4 | 11,982.98 | NA | NA | The one class model featured tobacco, alcohol and marijuana use. |
| 2 | −5799.27 | 11,632.53 | 11,725.92 | 11,671.91 | 0.501 | <0.0001 | 33% featured tobacco, alcohol and marijuana use; 67% featured tobacco only use. |
| 3 | −5745.15 | 11,542.3 | 11,685.13 | 11,602.53 | 0.598 | 0.0503 | 10% featured Rx sedative, Rx opioid and tobacco use; 55% featured tobacco only use; 34% featured tobacco, alcohol and marijuana use. |
| 4 | −5718.8 | 11,507.6 | 11,699.87 | 11,588.68 | 0.602 | 0.0192 | Similar to the four class model. An additional class featured cocaine, alcohol, marijuana, and tobacco use was identified. |
| 5 | −5710.33 | 11,508.66 | 11,750.36 | 11,610.58 | 0.692 | 0.0347 | See Fig. 1 |
| 6 | −5706.74 | 11,519.48 | 11,810.63 | 11,642.25 | 0.613 | 0.4617 | The six class model had three classes featured cocaine use, but the Prob. of using alcohol, marijuana, tobacco, Rx sedative, and Rx opioid varies. |