Table 4.
IOS values according to the results of Rrs5 and Xrs5 prior to the development of airway obstruction.
| Rrs5 | Xrs5 | |||||
|---|---|---|---|---|---|---|
| Positive (n = 59) | Negative (n = 11) | p value | Positive (n = 61) | Negative (n = 9) | p Value | |
| Baseline value (SD) | 1.07 (0.19) | 1.34 (0.21) | <0.001 | −0.41 (0.11) | 0.56 (0.11) | <0.001 |
| Change of Z-score (SD) | −0.13 (1.04) | −1.75 (1.24) | <0.001 | 0.41 (0.55) | −0.37 (0.49) | <0.001 |
| Stop Abs change value (SD) | 0.51 (0.16) | 0.19 (0.10) | <0.001 | −0.48 (0.15) | −0.32 (0.11) | 0.003 |
| Z-score (SD) | −3.51 (1.65) | −3.00 (1.35) | 0.336 | −2.46 (1.25) | −2.28 (0.99) | 0.779 |
| % Change (SD) | 44.16 (12.75) | −14.34 (7.88) | <0.001 | −117.1 (36.3) | −57.0 (15.0) | 0.003 |
| SD-index (SD) | −5.22 (1.61) | −1.94 (1.07) | <0.001 | −7.50 (2.33) | −5.01 (1.67) | <0.001 |
Positive response refers to a change of 30% or more in Rrs5 prior to development of airway obstruction (Condition 2). Negative response refers to no change in Rrs5. For Xrs5, a positive response refers to a change of 80% or more. The SD-index was obtained by dividing the change from baseline values by SDw, which was calculated by dividing the difference between the mean values of the 1st and 2nd measurements by √2; Rrs5, resistance at 5 Hz; Xrs5, reactance at 5 Hz; SD, standard deviation; Abs, absolute.