Arithmetic mean (SD) Difference A – B
(95% CI) 2
p-value 3  
Group A - CF Group B – healthy controls    
X5 [kPa/(L/sec)]1 –0.174 (0.082) –0.085 (0.062) –0.090 (–0.135, –0.045) <0.0001
FEV1 [L]
% predicted
2.37 (0.81)
67%
3.53 (0.74)
94%
–1.16 (–1.46, –0.86) 0.0002
AX [kPa/L]1 0.835 (1.017) 0.290 (0.116) 0.566 (0.069, 1.063) 0.0044
FVC [L] 3.44 (1.00) 4.36 (0.90) –0.91 (–1.34, –0.49) 0.0157
RF [Hz]1 15.8 (5.8) 12.1 (2.6) 3.9 (0.8, 7.0) 0.0385
FEV1: forced expiratory volume in 1 second; FVC: forced vital capacity; Frequency dependent reactance as indicators of reactive capacitance properties of the lung: (X5, RF, AX)
11 subject in Group A and 2 subjects in Group B did not have oscillometry results.
2Differences and ratios calculated from ANOVA with adjustment for matching.
3p-values calculated using non-parametric (Wilcoxon) test.
Table 3: Summary of spriometric and IOS values.