Investigation of the Prevalence and Diagnosis of Chronic Obstructive Pulmonary Disease in a Group of Elderly Individuals Residing in an Island Area of Ningbo

<div>General surveys of patients with COPD. (a) COPD occupational survey. (b) COPD educational level survey. (c) COPD patients in the highest hospitals. (d) COPD patients in the highest departments.</div>

Canadian Respiratory Journal

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Figure 4

Figure 4: Investigation of the Prevalence and Diagnosis of Chronic Obstructive Pulmonary Disease in a Group of Elderly Individuals Residing in an Island Area of Ningbo 

Figure 4 | Investigation of the Prevalence and Diagnosis of Chronic Obstructive Pulmonary Disease in a Group of Elderly Individuals Residing in an Island Area of Ningbo 