Effects of High-Frequency Chest Wall Oscillation Expectoration System on Pulmonary Rehabilitation and Cortisol Function in Patients with Severe AECOPD

Table 3

Comparison of pulmonary function changes between the two groups (, %).

Group	FVC		EFV1		EFV1/FVC
	Before the treatment	After treatment	Before the treatment	After treatment	Before the treatment	After treatment
Group A ()
Group B ()
	-0.005	2.618	-0.164	2.547	-0.766	2.907
	0.996	0.011	0.870	0.013	0.446	0.005

Note: vs. before treatment, ; FVC: forced vital capacity; FEV1: forced expiratory volume in first second; FEV1/FVC: forced expiratory volume in first second/forced vital capacity.