Table 1.
Selection Methods for pQCT Parameters
| Selection methods | Scanning sites | Parameters |
|---|---|---|
| PCA and Cox regression with backward eliminationa | 4% tibia | Total BMC, trabecular BMC |
| 33% radius | Total BMC, CSMI, SSIp | |
| 33% tibia | Cortical BMC, PMI, periosteal circumference | |
| Cox regressionb | 4% tibia | Total BMC, SSIx, SSIp |
| 33% radius | Total BMC and CSA, cortical BMC and CSA, periosteal circumference, CSMI, PMI, SM, SSIx, SSIp | |
| 33% tibia | Total CSA, periosteal circumference, SSIx | |
| 66% tibia | SM, SSIp |
PCA = principal-components analysis; BMC = bone mineral content; CSA = cross-sectional area; SSIx = sectional stress-strain index; SSIp = polar stress-strain index; CSMI = cross-sectional moment of inertia; PMI = polar moment of inertia; SM = section modulus.
Note: Bold = variables appeared in both selection processes.
a
Model was adjusted for age, BMI, and site.
b
Model was adjusted for age, BMI, site, and FN aBMD.