Table 7.
Skewness (L), median (M) and coefficient of variation (S) equations of reference data in boys by height.
| L | M | S | |
|---|---|---|---|
| Bone mineral densities: | |||
| tibia 4% trabecular bone density | -0,5997 | 200,183-0,61762*height+4,32092*10-3*height2 | 7,15718*10-2+3,21482*10-4*height |
| tibia 4% total bone density | 0,1987 | -20576,9264+970,939843*height-18,6484612*height2+0,189068134*height3-1,0662092*10-3*height4+3,168456*10-6*height5-3,873361*10-9*height6 | 3,1055*10-2+4,34676*10-4*height |
| tibia 14% cortical bone density | 2,9340 | 34346,82-1234,5212*height+17,94951*height2-0,12843*height3+4,52647*10-4*height4-6,2860 *10-7*height5 | 3,1634*10-2 |
| tibia 38% cortical bone density | 4,9672 | 75779,9894-3265,39257*height+58,535159*height2-0,55135735*height3+2,87931*10-3*height4-7,90795*10-6*height5+8,93121*10-9*height6 | -2,9987616+0,1079134*height-1,5140745*10-3*height2+1,047007*10-5*height3-3,5706*10-8*height4+4,803898*10-11*height5 |
| Bone masses: | |||
| tibia 4% bone mass | -0,1220 | 1,97259-3,39998*10-2*height+2,3726*10-4*height2 | 1,3117-4,8453*10-2*height+6,15527*10-4*height2-3,1517*10-6*height3+5,70261*10-9*height4 |
| tibia 14% bone mass | 1,1580 | 0,73912-1,4807*10-2*height+1,4514*10-4*height2 | 0,277237-1,4437*10-2*height+2,18965*10-4*height2-1,1988*10-6*height3+2,22643*10-9*height4 |
| tibia 38% bone mass | 1,78866 | 1,56796-2,8963*10-2*height+2,32385*10-4*height2 | 0,916189-3,563*10-2*height+4,58618*10-4*height2-2,3362*10-6*height3+4,15619*10-9*height4 |
| Cross-sectional bone dimensions: | |||
| tibia 14% inner cortical bone circumference | 6,1170*10-2 | 10,7713+0,216343*height+3,67005*10-4*height2 | 0,630537-2,0979*10-2*height+2,5633*10-4*height2-1,2566*10-6*height3+2,16801*10-9*height4 |
| tibia 38% inner cortical bone circumference | 0,6431 | 93,5557-1,7584*height+1,41779*10-2*height2-3,3488 *10-5*height3 | 8,9690*10-2 |
| tibia 14% outer cortical bone circumference | 1,8465 | 99,8532-1,6635*height+1,45412*10-2*height2-3,2982 *10-5*height3 | 0,821803-2,6315*10-2*height+3,03449*10-4*height2-1,4392*10-6*height3+2,41695 *10-9*height4 |
| tibia 38% outer cortical bone circumference | 3,2876 | 93,6545-1,6355*height+1,452*10-2*height2-3,31796 *10-5*height3 | 0,514444-1,6771*10-2*height+1,94698 *10-4*height2-9,1193*10-7*height3+1,4874 *10-9*height4 |
| tibia 14% cortical shell thickness | 0,8238 | 262,927425-9,2478634*height+0,1285329*height2-8,787944*10-4*height3+2,961946*10-6*height4-3,93825*10-9*height5 | 8,07385-0,27364*height+3,49572*10-3*height2-1,8837*10-5*height3+2,1353*10-8*height4+1,5950*10-10*height5-4,3051*10-13*height6 |
| tibia 38% cortical shell thickness | 8,0732*10-2 | 0,14501+1,72803*10-2*height+6,71656*10-5*height2 | 9,66555*10-2 |
| tibia 14% cortical bone cross-sectional area | 0,2483 | -4,3523-0,13727*height+6,97975*10-3*height2 | 8,511526-0,317056839*height+4,652523*10-3*height2-3,334365*10-5*height3+1,171552*10-7*height4-1,61839599*10-10*height5 |
| tibia 38% cortical bone cross-sectional area | 0,8404 | 34,6094-0,92780*height+1,40242*10-2*height2 | 1,31673-4,3702*10-2*height+5,17865*10-4*height2-2,5036*10-6*height3+4,26367 *10-9*height4 |
| tibia 4% total bone cross-sectional area | -0,58337 | -129,47+0,763578*height+3,35744*10-2*height2 | 1,43979-4,0392*10-2*height+4,34936*10-4*height2-1,9966*10-6*height3+3,34038 *10-9*height4 |
| tibia 14% total bone cross-sectional area | 0,9850 | 1312,2-28,087*height+0,212575*height2-4,5363 *10-4*height3 | 1,24425-4,2546*10-2*height+5,12052*10-4*height2-2,4868*10-6*height3+4,23687 *10-9*height4 |
| tibia 38% total bone cross-sectional area | 1,9341 | 1324,82-28,855*height+0,217878*height2-4,6817 *10-4*height3 | -0,24955+2,77248*10-3*height+7,80171 *10-6*height2-6,9121*10-8*height3 |
| Longitudinal shape indexes: | |||
| tibia 4% bone mass/tibia 38% bone mass | -0,5120 | 0,910835+4,84818*10-5*height | 6,59501*10-2+7,29081*10-5*height |
| tibia 14 cortical bone cross-sectional area/tibia 4% total bone cross-sectional area | 1,0671 | 18,071 | 0,123671+1,9679*10-4*height |
| Strength strain indexes: | |||
| tibia 14% polar SSI | 1,2607 | 641,883-16,349*height+0,121737*height2 | 1,95495-5,8667*10-2*height+6,5576*10-4*height2-3,0613*10-6*height3+5,09586 *10-9*height4 |
| tibia 38% polar SSI | 1,50984 | 549,831-15,454*height+0,123465*height2 | 0,924153-3,2983*10-2*height+4,15979 *10-4*height2-2,0763*10-6*height3+3,59062*10-9*height4 |
| Muscle and bone: | |||
| lower leg 66% muscle cross-sectional area | 0,1487 | 3287,27-55,792*height+0,434791*height2 | 1,38028-4,0067*10-2*height+4,42975 *10-4*height2-2,0613*10-6*height3+3,45751*10-9*height4 |
| lower leg 66% total cortical bone cross-sectional area/muscle cross-sectional area | -0,6742 | 11,8540+8,9291*10-2*height-6,6293*10-3 *height2+8,7163*10-5*height3-4,46365 *10-7*height4+8,0707*10-0*height5 | 0,1114 |
SSI - strength strain index.