Table 2.
Trajectory model goodness of fit indices
| Number of trajectories | Opioid trajectory | |||||
|---|---|---|---|---|---|---|
| Linear | Linear + quadratic | |||||
| AIC | BIC | SC (%) | AIC | BIC | SC (%) | |
| 1 | 11,661.17 | 11,669.16 | 100 | 11,558.96 | 11,569.62 | 100 |
| 2 | 9815.50 | 9831.48 | 29.2 | 9512.10 | 9533.41 | 29.2 |
| 3 | 8865.47 | 8889.44 | 22.6 | 8321.96 | 8353.92 | 22.6 |
| 4 | 8378.71 | 8410.67 | 17.9 | 7642.71 | 7685.33 | 17.9 |
| 5 | 7793.72 | 7833.67 | 7.5 | 6708.04* | 6761.31* | 7.5* |
| 6 | 7560.05 | 7607.99 | 2.8 | 6274.58 | 6338.51 | 2.8 |
Notes: *Indicates model with the best fit based on lowest Akaike information criterion (AIC) and Bayesian information criterion (BIC), >0.80 entropy (reflecting high confidence of group membership), a minimum trajectory class size of 5% of total study population, parsimony and theoretical soundness.
Abbreviation: AIC, Akaike information criterion; BIC, Bayesian information criterion; SC, smallest class size.