Table 2.
Summary of spirometry and oscillometry measures.
| Overall | Group 1 | Group 2 | Group 3 | Group 4 | Group 5 | p-value | |
|---|---|---|---|---|---|---|---|
| Spirometry measures, n | 2826 | 1084 | 489 | 413 | 215 | 625 | |
| % Predicted FEV1, mean ± SD | 89.0 ± 17.9 | 87.6 ± 18.1 | 89.1 ± 17.6 | 88.2 ± 18.4 | 91.5 ± 17.4 | 91.0 ± 17.1 | 0.001 |
| % Predicted FVC, mean ± SD | 92.4 ± 16.3 | 90.7 ± 16.1 | 93.3 ± 16.1 | 91.4 ± 15.8 | 95.6 ± 16.4 | 93.9 ± 16.6 | < 0.001 |
| FEV1/FVC ratio, mean ± SD | 75.6 ± 9.0 | 75.3 ± 9.2 | 74.6 ± 9.0 | 75.3 ± 9.9 | 75.8 ± 8.8 | 76.9 ± 8.0 | < 0.001 |
| Oscillometry measures, n | 2734 | 1062 | 474 | 403 | 206 | 589 | |
| R5, cmH2O L–1 s, median (IQR) | 4.60 (3.59, 5.93) | 4.66 (3.65, 6.03) | 4.46 (3.49, 5.66) | 4.49 (3.58, 5.66) | 4.47 (3.42, 5.87) | 4.68 (3.68, 6.16) | 0.018 |
| R5–20, cmH2O L–1 s, median (IQR) | 1.03 (0.57, 1.74) | 1.12 (0.66, 1.84) | 0.94 (0.47, 1.59) | 1.02 (0.59, 1.54) | 0.94 (0.41, 1.69) | 1.00 (0.55, 1.81) | < 0.001 |
| AX, median (IQR) | 6.91 (3.36, 14.28) | 8.19 (3.90, 15.48) | 5.88 (2.91, 12.85) | 6.93 (3.54, 13.14) | 6.12 (2.30, 13.09) | 6.27 (3.01, 15.17) | < 0.001 |