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

Table 2

Measured resistance values of series combinations of resistors.

Pneumotachographs	Resistance; (kPa·L^−1·s)	Hans Rudolph standard flow resistors	Resistance; (kPa·L^−1·s)
PT no. 1	0.119	HR1	0.194
PT no. 1 + PT no. 21	0.169	HR1-2	0.382
PT no. 1 + PT no. 21-2	0.217	HR1-3	0.571
PT no. 1 + PT no. 21–3	0.265	HR1-4	0.759
PT no. 1 + PT no. 21–4	0.309	HR1-5	0.956