Correlation between dual-energy X-ray absorptiometry areal bone mineral density (BMD) and peripheral quantitative computer tomography volumetric BMD and bone strength indices at the tibia. FNBMD, femoral neck BMD; LSBMD, lumbar spine BMD; Total.vBMD.4, total volumetric BMD at the 4% site; Total.vBMD.38, total volumetric BMD at the 38% site; Trab.vBMD4, trabecular vBMD at the 4% site; Cort.vBMD.38, cortical vBMD at the 38% site; Polar.SSI, polar strength-strain index; Fx.Load.X3, fracture load at the 66% site.