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

Table 1

Comparison of symptom improvement between the two groups (, d).

Group	Sputum relief time	Remission time of lung signs	The length of time
Group A ()
Group B ()
	-3.276	-4.576	-6.889
	0.002	<0.001	<0.001