Characteristics, treatments, in-hospital and long-term outcomes among inpatients with acute exacerbation of chronic obstructive pulmonary disease in China: sex differences in a large cohort study.

"Declarations Ethics approval and consent to participateThis study was approved by the Ethics Committee of West China Hospital of Sichuan University. Written informed consent was obtained from all the participants. Consent for publicationThe participant has consented to the submission of this article to the journal. Conflict of interestThe authors declare that the research had no conflicts of interest. Conflict of interest The authors declare that the research had no conflicts of interest."

"Funding This study was supported by the National Natural Science Foundation of China (82170013), the Sichuan Science and Technology Program (2022YFS0262) and the National Key Research Program of China (2016YFC1304202)."

"Clinical Trial Registration Retrospectively registered, registration number is ChiCTR2100044625, date of registration 21/03/2021. URL: http://www.chictr.org.cn/showproj.aspx?proj=121626."