Table 4.
Univariate associations with annual change in thoracic vertebral
| Variables | Spearman's rank correlation (ρ) | p-value |
|---|---|---|
| Baseline characteristics | ||
| Age | −0.18 | 0.26 |
| Body mass index | −0.04 | 0.80 |
| Smoking history | 0.20 | 0.20 |
| FEV1 absolute | 0.32 | 0.04 |
| %FEV1 predict | 0.11 | 0.49 |
| DLCO /VA | 0.16 | 0.30 |
| LAA% (−960) | 0.03 | 0.86 |
| PaO2 | 0.29 | 0.07 |
| Annual change | ||
| Frequency of excerbation | −0.37 | 0.02 |
| ΔFEV1 | −0.16 | 0.32 |
| Δ%FEV1 | 0.00 | 0.98 |
| ΔBMI | 0.05 | 0.75 |
| ΔLAA%(−960) | −0.10 | 0.53 |
| ΔPaO2 | 0.22 | 0.20 |
Relationships were assessed by Spearman's rank correlation test. BMD, bone mineral density; FEV1, forced expiratory volume in 1 second; %FEV1, FEV1 % predicted; DLCO /VA, ratio of diffusing capacity to alveolar ventilation; LAA%, percentage of low attenuation area Δ means annual change in each variables.