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INTRODUCTION Sarcopenia is associated with outcomes in older-adults undergoing emergency surgery. Psoas major measurement is a surrogate marker of sarcopenia with multiple calculations existing normalising to body size and no consensus as to which is optimal. We compared three different psoas-major calculations to predict outcomes in older adults undergoing emergency laparotomy. METHODS Consecutive over 65s were identified from the National Emergency Laparotomy Audit(NELA) database at a single centre between 2014 and 2018. Psoas major w