Comparison of Respiratory Resistance Measurements Made with an Airflow Perturbation Device with Those from Impulse Oscillometry

Table 3

All subjects showed high linearity between APD-measured respiratory resistance and IOS-measured respiratory resistance, as indicated by strong goodness of fit coefficients. In addition, all subjects also showed slight overestimation by the APD compared with IOS R5.

	Correlation factor	Goodness of fit (𝑅^2)
Subject no. 1	1.306	0.997
Subject no. 2	1.198	0.997
Subject no. 3	1.105	0.993
Subject no. 4	1.265	0.993
Subject no. 5	1.160	0.912
Subject no. 6	1.142	0.998
Subject no. 7	1.149	0.998
Subject no. 8	1.312	0.993
Subject no. 9	1.247	0.992
Subject no. 10	1.197	0.977