Table 3.
Univariate linear regression analyses for all variables with bone density as outcome
| Variable | B (SE) | P-value |
|---|---|---|
| Age (years) | −1.78 (0.19) | <0.001 |
| BMI (kg/m2) | 0.27 (0.28) | 0.33 |
| Pack-years | −0.12 (0.06) | 0.04 |
| Smoking status | 5.79 (2.01) | 0.004 |
| FEV1 % predicted | 0.15 (0.06) | 0.008 |
| COPD status | 8.11 (2.06) | <0.001 |
| Perc15 | 0.19 (0.05) | <0.001 |
| Pi10 | −0.19 (1.97) | 0.92 |
| E/I-ratioMLD | −0.78 (0.16) | <0.001 |
| TI | 8.99 (10.29) | 0.38 |
Abbreviations: B, unstandardized coefficient; BMI, body mass index; E/I-ratioMLD, expiration to inspiration ratio of mean lung density; FEV1, forced expiratory volume in 1 second; Perc15, emphysema score as 15th percentile of attenuation distribution curve on inspiratory scan; Pi10, airway wall thickness at an internal perimeter of 10 mm; SE, standard error; TI, tracheal index.