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The construct validity of the Frail-VIG index with respect to the Frailty Phenotype (FP) was evaluated by calculating the area under the receiver operating characteristic curve (AUC-ROC). Intraclass correlation coefficient (ICC) was used to assess the inter-rater agreement and the reliability. A validation study mixing hospitalized and community-dwelling older people was designed. The study aimed to assess the reliability of the scores, evidence of validity, and feasibility of the Frail-VIG index. 8 Chronic Care Program, Ministry of Health, Generalitat de Catalunya, 08830 Catalonia, Spain.7 Nursing Department, Faculty of Nursing, Universitat de Girona, 17005 Girona, Spain.6 Gerència Territorial de Barcelona, Institut Català de la Salut, 08500 Barcelona, Spain.5 Fundació Institut Universitari per a la Recerca a L'atenció Primària de Salut Jordi Gol I Gurina (IDIAPJGol), 08500 Barcelona, Spain.4 Tissue Repair and Regeneration Laboratory (TR2Lab), Faculty of Sciences and Technology, Faculty of Medicine, University of Vic-Central University of Catalonia, 08500 Barcelona, Spain.3 Clinical Epidemiology Unit, Consorci Hospitalari de Vic, 08500 Barcelona, Spain.2 Geriatric and Palliative Care Department, Hospital Universitari de la Santa Creu and Hospital Universitari de Vic, 08500 Barcelona, Spain.1 Central Catalonia Chronicity Research Group (C3RG), Centre for Health and Social Care Research (CESS), Faculty of Medicine, University of Vic-Central University of Catalonia (UVIC-UCC), 08500 Barcelona, Spain.