Figures & data
Figure 1. The flow of the subjects. Abbreviations: CAT, COPD assessment test; 6MWD, 6-minute walking distance.
![Figure 1. The flow of the subjects. Abbreviations: CAT, COPD assessment test; 6MWD, 6-minute walking distance.](/cms/asset/9d9ed561-221e-4534-b34b-022e63f1ea72/icop_a_1844176_f0001_b.jpg)
Figure 2. Colored 3 D images of Rrs and Xrs in each from an individual subject in each category. These images show the 30-second time course of Rrs and Xrs during tidal breathing. Oscillometric values, including R5 and X5, were output automatically by the computer.
Abbreviations: Rrs, respiratory system resistance; R5, Rrs at 5Hz; Xrs, respiratory system reactance; X5, Xrs at 5Hz; 6MWD, 6-minute walking distance.
![Figure 2. Colored 3 D images of Rrs and Xrs in each from an individual subject in each category. These images show the 30-second time course of Rrs and Xrs during tidal breathing. Oscillometric values, including R5 and X5, were output automatically by the computer.Abbreviations: Rrs, respiratory system resistance; R5, Rrs at 5Hz; Xrs, respiratory system reactance; X5, Xrs at 5Hz; 6MWD, 6-minute walking distance.](/cms/asset/eb82b83c-df98-47fe-9e23-61b81c11393f/icop_a_1844176_f0002_c.jpg)
Table 1. Characteristics of the study subjects.
Table 2. Whole-breath and within-breath analyses of respiratory impedance.
Figure 3. Correlation between 6-minute walking distance and oscillometry. Abbreviations: ALX, low-frequency reactance area; Fres, resonant frequency; R5 and R20, respiratory system resistance at 5 Hz and 20 Hz; R5 − R20, the difference between R5 and R20; X5, respiratory system reactance at 5 Hz.
![Figure 3. Correlation between 6-minute walking distance and oscillometry. Abbreviations: ALX, low-frequency reactance area; Fres, resonant frequency; R5 and R20, respiratory system resistance at 5 Hz and 20 Hz; R5 − R20, the difference between R5 and R20; X5, respiratory system reactance at 5 Hz.](/cms/asset/6eeab919-51d9-4e93-b08c-a965ff23ef39/icop_a_1844176_f0003_b.jpg)
Table 3. Univariate and multivariate logistic regression analyses of 6MWD and predictor variables.