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Kaplan–Meier survival function: change of the FI-Lab during the hospital stay (∆FI-Lab21) stratified into patients who suffered from an increase of their FI-Lab (∆FI-Lab21 ≥0) and those patients whose FI-Lab did not change or decreased (∆FI-Lab21 <0) during the hospital stay.
Abbreviation: FI-Lab21, 21-item frailty index based on laboratory blood and urine tests.
