Table 2. Correlation of Spirometry and IOS Parameters in PD Patients (n = 21).

	R5 (kPa/l/s)	R20 (kPa/l/s)
FEV1% pred	–0.628**	–0.474*
FEV1/FVC	–0.487*	–
PEF% pred	–0.599**	–0.522*

Source: The authors.

Note: Level of significance is denoted by asterisk (*) and (**) at 5% and 1% respectively.