Table 4 Spearman’s correlation coefficients between airway volumes on CT and measurements on PFT.
Inspiratory airway volume in standing position | Inspiratory airway volume in sitting position | Inspiratory airway volume in supine position | Expiratory airway volume in standing position | Expiratory airway volume in sitting position | Expiratory airway volume in supine position | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
ρ | P value | ρ | P value | ρ | P value | ρ | P value | ρ | P value | ρ | P value | |
VC (mL) | 0.681 | < 0.0001 | 0.667 | < 0.0001 | 0.660 | < 0.0001 | 0.695 | < 0.0001 | 0.698 | < 0.0001 | 0.654 | < 0.0001 |
FVC (mL) | 0.673 | < 0.0001 | 0.662 | < 0.0001 | 0.659 | < 0.0001 | 0.689 | < 0.0001 | 0.692 | < 0.0001 | 0.654 | < 0.0001 |
FEV1 (mL) | 0.669 | < 0.0001 | 0.641 | < 0.0001 | 0.643 | < 0.0001 | 0.672 | < 0.0001 | 0.672 | < 0.0001 | 0.617 | < 0.0001 |
Inspiratory capacity (mL) | 0.640 | < 0.0001 | 0.604 | < 0.0001 | 0.632 | < 0.0001 | 0.596 | < 0.0001 | 0.593 | < 0.0001 | 0.537 | < 0.0001 |
Residual volume (mL) | 0.558 | < 0.0001 | 0.573 | < 0.0001 | 0.546 | < 0.0001 | 0.695 | < 0.0001 | 0.671 | < 0.0001 | 0.716 | < 0.0001 |
Functional residual capacity (mL) | 0.607 | < 0.0001 | 0.629 | < 0.0001 | 0.585 | < 0.0001 | 0.744 | < 0.0001 | 0.748 | < 0.0001 | 0.760 | < 0.0001 |
Total lung capacity (mL) | 0.726 | < 0.0001 | 0.721 | < 0.0001 | 0.709 | < 0.0001 | 0.785 | < 0.0001 | 0.780 | < 0.0001 | 0.760 | < 0.0001 |
