Table 2.
Spearman correlation between visual imaging scores and their semiautomated imaging correlates
| Visual Emphysema | Visual Airway Wall Thickness | LAA-950 | Pi10 | WAP | FEV1 % Predicted | |
|---|---|---|---|---|---|---|
| Visual emphysema | 1 | 0.50 (0.45–0.54) | 0.61 (0.57–0.64) | 0.15 (0.09–0.20) | 0.23 (0.17–0.27) | −0.58 (−0.61 to −0.54) |
| Visual airway wall thickness | — | 1 | 0.34 (0.29–0.38) | 0.28 (0.24–0.33) | 0.55 (0.51–0.59) | −0.63 (−0.65 to −0.59) |
| LAA-950 | — | — | 1 | −0.03 (−0.08 to 0.01) | 0.10 (0.04–0.14) | −0.49 (−0.53 to −0.44) |
| Pi10 | — | — | — | 1 | 0.41 (0.36–0.46) | −0.33 (−0.37 to −0.28) |
| WAP | — | — | — | — | 1 | −0.53 (−0.56 to −0.49) |
Definition of abbreviations: LAA-950 = percentage of low attenuation areas below −950 Hounsfield units; Pi10 = square root of wall area for airways standardized at an internal perimeter of 10 mm as calculated by VIDA software; WAP = wall area percent of airways for segmental (third-generation) bronchi as calculated by VIDA software.
Values in parentheses are 95% confidence intervals for Spearman rank correlation coefficients.