Median age at maturity, and summary of SITAR analyses of RUS bone score on age fitted to the four groups by sex and ethnicity
| White boys | Black boys | White girls | Black girls | |
|---|---|---|---|---|
| N of subjects/measurements | 106/575 | 214/1803 | 101/615 | 186/1572 |
| Median age at maturity (years) | 16.5 | 17.0 | 15.0 | 15.0 |
| Spline degrees of freedom | 5 | 7 | 7 | 6 |
| Residual SD (bone score units) | 29 | 30 | 22 | 23 |
| SD of tempo random effect (%) | 6.1 | 7.9 | 7.6 | 7.2 |
| SD of velocity random effect (%) | 20 | 20 | 22 | 15 |
| Tempo–velocity correlation | 0.2 | 0.2 | –0.2 | –0.2 |
| Variance explained (%) | 89 | 92 | 92 | 91 |
RUS, radius, ulna and short bones.