Influence of cheek support on respiratory impedance measured by forced oscillation technique

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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.