Predictive nomogram for in-hospital mortality among older patients with intra-abdominal sepsis incorporating skeletal muscle mass.

"Declarations Conflict of interestThe authors have no relevant financial or non-financial interests to disclose. Ethical approvalThe study protocol was approved by the Institutional Review Board of the Beijing Chao-Yang Hospital Capital Medical University (No. 2022-ke-430). Statement of human and animal rightsThe study was performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments. There are no animal subjects in this article. Informed consentInformed consent was obtained from each participant or their next of kin for participation in the study. Consent to participateInformed consent was obtained from each participant or their next of kin for participation in the study. Conflict of interest The authors have no relevant financial or non-financial interests to disclose."

"Funding This study was funded by the Open Project of the Beijing Key Laboratory (grant number 2020XFN-KFKT-02)."