Degree | No. of candidate models | Included age terms in the mixed effect model with the best fractional polynomial function | Goodness of fit (smaller is better)b | ||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
 |  | Age(-2) | Age(-1) | Age(-0.5) | log(Age) | Age0.5 | Age | Age2 | Age3 | -2 Log likelihood | BIC |
Boys (N = 1,680) | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
3 rd degree | 56 |  |  |  | × | × | × |  |  | 150196 | 150218 |
4th degree | 70 |  | × |  | × | × | × |  |  | 149688 | 149710 |
5th degree | 56 | × | × | × | × | × |  |  |  | 147836 | 147858 |
6th degree | 28 | × | × | × | × | × | × |  |  | 148889 | 148911 |
7th degree | 8 | × | × | × | × | × | × | × |  | 161668 | 161690 |
8th degree | 1 | × | × | × | × | × | × | × | × | 166173 | 166181 |
Girls (N = 1,609) | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â | Â |
3 rd degree | 56 |  |  |  | × | × | × |  |  | 141787 | 141809 |
4th degree | 70 |  | × | × | × | × |  |  |  | 139990 | 140012 |
5th degree | 56 | × | × | × | × | × |  |  |  | 138131 | 138153 |
6th degree | 28 | × | × | × | × | × | × |  |  | 140079 | 140101 |
7th degree | 8 | × | × | × | × | × | × | × |  | 152402 | 152424 |
8th degree | 1 | × | × | × | × | × | × | × | × | 156241 | 156248 |