Funding for this research was provided by:
the National Key R&D Program of China (No. 2022YFA0806400)
National Natural Science Foundation of China (No. 82470889)
Beijing Natural Science Foundation (No. L248018)
Article History
Received: 17 October 2025
Accepted: 27 August 2026
First Online: 5 September 2026
Declarations
Ethics approval and consent to participate: The CHARLS study received ethical approval from the Biomedical Ethics Review Committee of Peking University (IRB00001052-11015), and written informed consent was obtained from all participants. This study used publicly available de-identified CHARLS data and therefore did not require additional ethical approval.
Consent for publication: Not applicable.
Competing interests: The authors declare no competing interests.