| COPD (n = 9) | S (n = 9) | HNS (n = 6) | |
| 25th percentile (μm) | 11.6 | 10.3 | 10 |
| Median ( μm) | 13.9 | 12.2* | 12.1* |
| 75th percentile ( μm) | 16.5 | 14.4 | 13.9 |
| Vessels with intra-vascular macrophages (%) | 15.6 | 22.2 | 0 |
↵The Kruskal-Wallis test with application of Dunn’s post-test was used to determine the statistical significance of differences observed in the alveolar macrophage diameter between the three groups. *p < 0.0001 against COPD.