Table 3.

Effects of cheek support protocols on respiratory impedance spectra except COPD group

Impedance parameters		Cheek support protocols	Groups	Interaction between cheek support protocols and groups
			(healthy, asthma, ILD)
R5, cmH2O/L/s	Whole	P = 0.002*	NS	P = 0.034
	Inspiratory	P = 0.007	NS	NS
	Expiratory	P = 0.009	NS	NS
	Δ	NS	NS	NS
R20, cmH2O/L/s	Whole	NS	NS	NS
	Inspiratory	NS	NS	NS
	Expiratory	NS	NS	NS
	Δ	NS	NS	NS
R5/R20	Whole	P = 0.003*	P = 0.003†	NS
	Inspiratory	P = 0.002*	P = 0.006†	NS
	Expiratory	P = 0.009*	P = 0.002†	NS
X5, cmH2O/L/s	Whole	P < 0.001*, **	P = 0.040†	P = 0.033
	Inspiratory	P < 0.001*	P = 0.032†	P = 0.044
	Expiratory	P = 0.002	NS	NS
	Δ	NS	NS	NS

Difference between two cheek support protocols (supported by subjects and the operator) in respiratory impedance during a whole-breath (Whole), inspiratory and expiratory phases, and the difference (Δ) between inspiratory and expiratory phases were compared by two-way repeated measure ANOVA followed by Bonferroni test for post hoc analysis in healthy subjects (n = 10), patients with asthma (n = 7), and interstitial lung disease (ILD) (n = 7). Significantly different (P < 0.05) between cheek support protocols in ILD (*) or asthma (**) group. †: Significantly different (P < 0.05) between asthma and healthy groups.