Table 3 Analysis of variance for ESI values among PRISm and GOLD stages and for subgroups with different emphysema severity (%LAA-950insp) at CT
From: Validation of a method to assess emphysema severity by spirometry in the COPDGene study
|  |  | N | ESI mean (SD) | ANOVA / Welch’s t-test |
|---|---|---|---|---|
PRISm and GOLD stages |  PRISm | 641 | 0.9 (0.4) | p < .001 |
0 | 2646 | 0.9 (0.3) | ||
1 | 499 | 1.4 (0.4) | ||
2 | 1169 | 2.1 (1.1) | ||
3 | 662 | 5.0 (2.1) | ||
4 | 313 | 8.3 (2.0) | ||
%LAA-950insp | No Emphysema (< 6%) | 4223 | 1.1 (0.8) | p < .001 |
Moderate Emphysema (6–14%) | 866 | 2.4 (2.0) | ||
Severe Emphysema (≥14%) | 841 | 5.9 (2.8) |