[Retracted] Efficacy of Xiyanping in the Treatment of Elderly Patients with Chronic Obstructive Pulmonary Disease and Its Effect on the Expression of GDF-15 and HIF-1α in Serum

Table 5

Differences in pulmonary function indexes between the two groups ().

Group		FEV1 (L)		FVC (L)		FEV1/FVC (%)
		Before	After	Before	After	Before	After
Control group	43
Observation group	43
		0.201	4.172	0.555	3.189	0.990	6.045
		0.841	<0.001	0.580	0.002	0.325	<0.001

Compared with before treatment, .