Summary of stepwise regression model for the prediction of BMC of the distal radius and of the BMD of the L2 to L4 vertebrae
| Independent variables | BMC of the distal radius | BMD of the L2 to L4 vertebrae | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Boys | Girls | Boys | Girls | ||||||||
| Coefficients b | p value | Coefficients b | p value | Coefficients b | p value | Coefficients b | p value | ||||
| Age | 0.056 | < 0.0001 | 0.033 | 0.0096 | 0.090 | < 0.0001 | 0.045 | 0.0069 | |||
| Weight | 0.004 | 0.0002 | 0.003 | 0.0088 | 0.007 | < 0.0001 | 0.009 | < 0.0001 | |||
| Bone width | 0.332 | < 0.0001 | 0.516 | < 0.0001 | |||||||
| Flex test | 0.003 | 0.0028 | |||||||||
| Pubic hair | 0.046 | 0.0012 | 0.060 | 0.0013 | |||||||
| Jump | 0.004 | < 0.0001 | |||||||||
| Sit up test | 0.005 | < 0.0001 | |||||||||
| Constant | −0.699 | −0.425 | −0.948 | −0.321 | |||||||
| R2 | 0.779 | 0.673 | 0.740 | 0.670 | |||||||
The variables entered in the analysis were: age, weight, height, bone width, genitalia/breast development, pubic hair, testicular size/menarche, group, level of sports, recovery index after the 3 minute step test, sit and reach test, 1 minute sit up test, grip strength, vertical jump, and calcium intake.