Table 3. Multivariable Predictor of CT Thoracic Vertebral Bone Density.

Variables	Standardized β-Coefficients	P	r2
Patient age	-0.167	0.010	0.159
BMI (kg/m2)	0.066	0.345
Smoking history (pack-year)	0.027	0.661
FEV1 (% predicted)	0.065	0.460
FEV1/FVC	0.102	0.310
DLCO (% predicted)	0.118	0.155
6MWD	0.149	0.033
EI (%)	0.093	0.367
Platelet	-0.109	0.069

ESR and CRP were excluded in multiple regression analysis due to missing value.