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Fig. 1 | BMC Pulmonary Medicine

Fig. 1

From: Proportions and risk factors of chronic obstructive pulmonary disease and preserved ratio impaired spirometry, and association with small airway disease, in the positive screening older population from China: a cross-sectional study

Fig. 1

Study flow chart. Abbreviations: COPD:Chronic obstructive pulmonary disease; PRISmPreserved ratio impaired spirometry; COPD-SQ:COPD screening questionnaire; CAT:COPD assessment test; FEV1/FVC:Forced expiratory volume in 1 s/forced vital capacity

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BMC Pulmonary Medicine

ISSN: 1471-2466

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