Model specification | Fixed effects | Random effects | Bayesian Information Criteria | Percentage of variance explained |
Boys’ height | ||||
M1 | Absolute size | Absolute size | 14 298 | 68.5 |
M2* | Absolute size+intensity | Absolute size+intensity | 12 471 | 80.6 |
M3 | Absolute size+timing+intensity | Absolute size+timing+intensity | No convergence | N/A |
Girls’ height | ||||
F1 | Absolute size | Absolute size | 14 253 | 67.7 |
F2* | Absolute size+intensity | Absolute size +Intensity | 12 421 | 80.2 |
F3 | Absolute size+timing+intensity | Absolute size+timing+intensity | No convergence | N/A |
Age in months was log transformed for all models; all models were fit using 4 df.
*Final model selected.
N/A, not applicable; SITAR, Super-Imposition by Translation And Rotation.