Fig. 2From: 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 studyQuestionnaire scores of participants. Abbreviations: COPD:Chronic obstructive pulmonary disease; PRISm:Preserved ratio impaired spirometry; COPD-SQ:COPD screening questionnaire; COPD-PS:COPD population screener; CAT:COPD assessment testBack to article page