Table 3.
Repeatability of bronchial responsiveness in resistance and reactance at 5 Hz with impulse oscillation system and wheezing.
| Resistance at 5 Hz | Reactance at 5 Hz | |||
|---|---|---|---|---|
| PCZs2 | PCSDi3 | PCZs2 | PCSDi3 | |
| Δ Doubling concentration (95% CI) | 0.78 (0.49–1.07) | 0.83 (0.56–1.08) | 0.87 (0.63–1.11) | 0.81 (0.57–1.05) |
| Within-subject SD | 0.75 | 0.73 | 0.73 | 0.75 |
| ICC (95% CI) | 0.78 (0.45–0.89) | 0.71 (0.35–0.87) | 0.68 (0.28–0.86) | 0.83 (0.65–0.91) |
| Coefficient of repeatability | 1.43 | 1.46 | 1.51 | 1.45 |
Mean difference (SD) between the number of doubling concentrations of methacholine required to achieve PC at challenge tests 1 and 2. PCZS2, provocative concentration at which the Z-score is 2; PCSDi3, provocative concentration at which the SD-index is 3; CI, confidence interval; ICC, intraclass correlation coefficient.