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.

"Declarations Ethics approval and consent to participateThe study was approved by The Ethics Committee of The First Affiliated Hospital of Shaoxing University. All participants signed informed consent, and all personal information was de-identified before further analyses. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding The study was supported by The People’s Government of Zhejiang Province and Zhejiang Conba Hospital Management Soft Science Research Programme (No. 2023ZHA-KEB325). The study was also supported by Hygiene Health and Technology Plan of Shaoxing City in 2022 (No. 2022KY009) and Science and Technology Bureau Basic Public Welfare Plan Project of Shaoxing City (No. 2023A14005)."