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. Author manuscript; available in PMC: 2016 Nov 3.
Published in final edited form as: J Clin Densitom. 2014 Aug 13;18(1):124–135. doi: 10.1016/j.jocd.2014.07.005

Table 4.

Linear Relationships Between pQCT and hr-pQCT Bone Structure Values at the Ultradistal Radius (11.5 mm From End Plate) and Ultradistal Tibia (24.5 mm From End Plate)

pQCT bone outcome Slope, 95% CI (lower, upper) Intercept, 95% CI (lower, upper) R2 p Value
Ultradistal radius
 BV/TV 0.293 (0.257, 0.33) −0.011 (−0.026, 0.005) 0.849 <0.001
 Tb.Sp 0.696 (0.497, 0.895) 0.160 (0.047, 0.272) 0.514 <0.001
 Tb.Sp MI 0.695 (0.471, 0.919) 0.167 (0.041, 0.294) 0.497 <0.001
 Tb.Th 0.158 (0.114, 0.201) 0.005 (−0.011, 0.021) 0.531 <0.001
 Tb.Th MI 0.159 (0.116, 0.202) 0.000 (−0.017, 0.017) 0.542 <0.001
 Tb.N 1.7 (1.3, 2.2) −0.2 (−0.7, 0.3) 0.583 <0.001
 Ct.Th 0.768 (0.255, 1.281) −0.036 (−0.506, 0.435) 0.162 0.004
 vBMDi 0.90 (0.72, 1.08) 45.26 (−1.70, 92.22) 0.685 <0.001
 vBMDc 0.59 (0.38, 0.80) 297.93 (115.48, 480.38) 0.400 <0.001
 vBMDtr 1.15 (1.00, 1.30) −67.01 (−93.61, −40.40) 0.837 <0.001
Ultradistal tibia
 BV/TV 0.334 (0.267, 0.401) −0.015 (−0.043, 0.013) 0.682 <0.001
 Tb.Sp 0.724 (0.386, 1.062) 0.124 (−0.078, 0.325) 0.283 <0.001
 Tb.Sp MI 0.724 (0.386, 1.062) 0.124 (−0.078, 0.326) 0.283 <0.001
 Tb.Th 0.217 (0.128, 0.307) −0.014 (−0.048, 0.020) 0.337 <0.001
 Tb.Th MI 0.217 (0.128, 0.307) −0.014 (−0.048, 0.020) 0.337 <0.001
 Tb.N 1.8 (1.3, 2.3) −0.1 (−0.7, 0.4) 0.526 <0.001
 Ct.Th 1.249 (1.017, 1.481) −0.726 (−1.029, −0.422) 0.714 <0.001
 vBMDi 0.89 (0.73, 1.04) −49.86 (−102.27, 2.56) 0.737 <0.001
 vBMDc 1.33 (0.81, 1.86) −545.70 (−1059.23, −32.16) 0.356 <0.001
 vBMDtr 1.10 (0.83, 1.37) −35.10 (−80.18, 9.98) 0.592 <0.001

Note: hr-pQCT bone structural variables were used as the dependent variable, and pQCT bone structure was treated as an independent variable. Where unspecified, model-dependent equations were used in the computation of the variable.

Abbr: BV/TV, bone volume fraction; CI, confidence interval; Ct.Th, cortical thickness; hr-pQCT, high-resolution peripheral quantitative computed tomography; MI, model-independent measures; pQCT, peripheral quantitative computed tomography; vBMDc, cortical volumetric bone mineral density; vBMDi, integral volumetric bone mineral density; vBMDtr, trabecular volumetric bone mineral density; Tb.N, trabecular number; Tb.Sp, trabecular separation; Tb.Th, trabecular thickness.