Clinical frailty scale: Inter-rater reliability of retrospective scoring in emergency abdominal surgery.

Background: Frailty is a complex syndrome shown to be an independent predictor of morbidity and mortality after surgery in older patients. Frailty scoring may, therefore, be important, for example, for pre-operative risk assessment and prognosis estimation. The Clinical Frailty Scale (CFS) has been developed to help operationalize frailty in the individual patient.