Table 2.
Results of measurements with oscillometry.
| Variable | Instrument | All subjects | COPD | Healthy subjects |
|---|---|---|---|---|
| R5 (kPa.s.L−1) | IOS | 0.36 ± 0.09 | 0.39 ± 0.08 | 0.31 ± 0.08*** |
| tremoflo | 0.35 ± 0.12 | 0.41 ± 0.11 | 0.26 ± 0.07 | |
| R20 (kPa.s.L−1) | IOS | 0.29 ± 0.07 | 0.30 ± 0.08 | 0.40 ± 0.05*** |
| R19 (kPa.s.L−1) | tremoflo | 0.29 ± 0.06 | 0.31 ± 0.06 | 0.25 ± 0.04 |
| R5-R20 (kPa.s.L−1) | IOS | 0.05 ± 0.06 | 0.08 ± 0.06 | 0.02 ± 0.05 |
| R5-R19 (kPa.s.L−1) | tremoflo | 0.06 ± 0.09 | 0.10 ± 0.09 | 0.00 ± 0.04 |
| X5 (kPa.s.L−1) | IOS | −0.13 ± 0.08*** | −0.15 ± 0.09*** | −0.09 ± 0.03 |
| tremoflo | −0.20 ± 0.17 | −0.27 ± 0.18 | −0.10 ± 0.04 | |
| fres (Hz) | IOS | 12.5 ± 4.4*** | 14.4 ± 4.4*** | 9.4 ± 2.3*** |
| tremoflo | 17.0 ± 6.7 | 20.8 ± 5.6 | 10.9 ± 2.6** | |
| AX (kPa.s.L−1) | IOS | 0.55 ± 0.59*** | 0.75 ± 0.66*** | 0.21 ± 0.17 |
| tremoflo | 1.34 ± 1.62 | 1.99 ± 1.78 | 0.31 ± 0.22 |
Mean ± SD. Significant differences between IOS and tremoflo: **p < 0.01, ***p < 0.001, paired, two-tailed t-test.