Clinical Implications of Oscillatory Lung Function during Methacholine Bronchoprovocation Testing of Preschool Children

Table 4

IOS values according to the results of Rrs5 and Xrs5 prior to the development of airway obstruction.

	Rrs5			Xrs5
	Positive	Negative	value	Positive	Negative	p Value
Baseline value (SD)	1.07	1.34 (0.21)	<0.001	(0.11)	0.56 (0.11)	<0.001
Change of -score (SD)	(1.04)	(1.24)	<0.001	0.41 (0.55)	(0.49)	<0.001
Stop Abs change value (SD)	0.51 (0.16)	0.19 (0.10)	<0.001	(0.15)	(0.11)	0.003
-score (SD)	(1.65)	(1.35)	0.336	(1.25)	(0.99)	0.779
% Change (SD)	44.16	(7.88)	<0.001	(36.3)	(15.0)	0.003
SD-index (SD)		(1.07)	<0.001	(2.33)	(1.67)	<0.001

Positive response refers to a change of 30% or more in Rrs5 prior to development of airway obstruction (Condition ). 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.