Table 3.
Interpretation of quantitative imaging parameters
| Predominant phenotype | QI imaging parameter(s) | Interpretation | Criteria for abnormal | Controls n = 45 |
Deployers n = 82 |
p-value* |
|---|---|---|---|---|---|---|
| Emphysema | LAA%-950 (%) | Increases with extent of emphysema | ≥ 10% low attenuation areas | 9 (20%) | 19 (23%) | 0.004 |
| Airway | Pi10 (mm) | Increases with extent of airway wall thickening | > median (2.26 mm) | 8 (18%) | 28 (34%) | |
| Mixed |
LAA%-950 (%) Pi10 (mm) |
As above for both parameters |
≥ 10% low attenuation areas > median (2.26 mm) |
2 (4%) | 13 (16%) | |
| Normal |
LAA%-950 (%) Pi10 (mm) |
– |
< 10% low attenuation areas ≤ median (2.26 mm) |
26 (58%) | 22 (27%) | |
| Air trapping |
E/I TLV Ratio E/I MLD Ratio LAA%-856 (%) |
Increase with extent of air trapping | No established cut points | – | – | – |
Bold value is statistically significant
Results are the number (%)
*Deployers and controls were compared using Chi square tests