Premorbid frailty was common in general ICU patients and was an independent predictor of death. Our study suggests that frailty could be a valuable addition in outcome prediction in intensive care.

The receiver operating curve, area under the curve of CFS did not differ significantly from that of SAPS3, whereas combining the two resulted in an improved discriminatory ability.

Data on premorbid frailty (clinical frailty scale; CFS), severity of illness (the simplified acute physiology score, third version; SAPS3), therapeutic procedures, limitations of care and outcome were collected in 872 adult ICU patients.

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