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

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
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 and 2. , provocative concentration at which the -score is 2; , provocative concentration at which the SD-index is 3; CI, confidence interval; ICC, intraclass correlation coefficient.