Table 10.

The AUC of IOS parameters in different groups

IOS parameters	AUC in overall patients	AUC in the geriatric patients	AUC in the advanced elderly patients
Fres (L/s)	0.905	0.909	0.914
R5–R20 (%predicted)	0.883	0.885	0.863
X5 (kPa/L/s)	0.854	0.850	0.800
Z5 (%predicted)	0.838	0.872	0.834
R5 (%predicted)	0.829	0.867	0.825
R20 (%predicted)	0.654	0.768	0.711

Abbreviations: ROC, receiver operating characteristic; AUC, area under the curve; IOS, impulse oscillometry; Fres, resonant frequency; R5–R20, respiratory resistance; X5, respiratory reactance; Z5, respiratory impedance.