Preoperative risk factors including serum levels of potassium, sodium, and creatinine for early mortality after open abdominal surgery: a retrospective cohort study.

BMC Surg · 2021 · PMC7836189 · PMID 33499844

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did not reach statistical significanceno p-value reported

Time from blood test to surgery and surgical group IV (appendix) did not reach statistical significance and were therefore excluded from the final model.

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