Table 1.
Growth mixture modeling model fit statistics for twins
| Classes | Linear | Quadratic | ||
|---|---|---|---|---|
| BIC | LMR-LRT | BIC | LMR-LRT | |
| Boys | ||||
| 1 | 55,243.60 | n.a. | 55,235.58 | n.a. |
| 2 | 54,091.14 | <0.001 | 54,069.46 | <0.001 |
| 3 | 53,449.35 | <0.001 | 53,409.63 | <0.001 |
| 4 | 53,261.68 | 0.06 | 53,210.41 | 0.18 |
| Girls | ||||
| 1 | 52,874.79 | n.a. | 52,880.37 | n.a. |
| 2 | 51,421.16 | <0.001 | 51,425.08 | <0.001 |
| 3 | 50,875.96 | 0.02 | 50,895.03 | 0.22 |
| 4 | 50,345.62 | 0.10 | 50,323.00 | 0.11 |
BIC Bayesian Information Criterion, LMR-LRT represents the p value of the Lo–Mendell–Rubin likelihood ratio test [22], which was included for comparison, n.a. not applicable
Intercept factor variances are equal across classes, slope factor variances are fixed to zero