[Retracted] A Retrospective Study of Diaphragmatic Breathing Training Combined with Discharge Care Bundles in Patients with Chronic Obstructive Pulmonary Disease

Table 1

Global initiative for chronic obstructive lung disease (GOLD) of severe to moderate COPD.

Stage	Characteristics
Moderate	FEV1/FVC < 70%; 50% ≤ FEV1 < 80%; With or without chronic symptoms (cough and sputum production)
Severe	FEV1/FVC < 70%; 30% ≤ FEV1 < 50%; With or without chronic symptoms (cough and sputum production)