Corrêa, LauraJúdice, AndréScoz, RobsonMachado, VanessaMendes, José JoãoProença, LuísBotelho, JoãoFerreira, Luciano2026-04-132026-04-132024-10Corrêa L, Júdice A, Scoz R, Machado V, Mendes JJ, Proença L, Botelho J, Ferreira L Portuguese Version of the Oral Frailty Index-8: Instrument Validation Study. Interact J Med Res 2024;13:e49975 doi: 10.2196/499751929-073Xhttp://hdl.handle.net/10400.26/62675Background: The concept of oral frailty has gained scientific and clinical relevance in recent years, and early detection can facilitate timely intervention to manage its progression. The Oral Frailty Index-8 (OFI-8) was developed to assess community-dwelling older adults at risk for oral frailty. Objective: This study aims to investigate the psychometric validity of the OFI-8 in the Portuguese population, named the Portuguese version of the OFI-8 (OFI-8-PT), which may serve as a reference for future studies related to longevity and oral function. Methods: This study included 2 main phases, involving patients aged 60 years or older, Portuguese speakers, and those who consented to participate in the study. First, the researchers translated and cross-culturally adapted the original questionnaire to make it suitable for native Portuguese speakers. The translated tool was then assessed for psychometric validation, which consisted of test-retest reliability, internal consistency, construct validity, and sex invariance measurement. Results: A total of 159 older adults participated in the baseline survey, with almost equal numbers of male (n=79, 49.7%) and female participants (n=80, 50.3%). The OFI-8-PT demonstrated good reliability (Cronbach α=0.95) and construct validity (goodness-of-fit index=0.96; comparative fit index=0.85; and root mean square error of approximation=0.05, 90% CI 0.00-0.09). The study found sex invariance, indicating that the OFI-8-PT is equally valid for male and female participants, and the tested-retest reliability of the OFI-8-PT was good, indicating consistent results over time. Conclusions:: The OFI-8-PT showed psychometric validity and good reliability to be used in the Portuguese population.engoral frailtyoral healthfunctional disabilityfrailtyagingdentistryconfirmatory factor analysispsychometric validityquestionnaire developmentcontribution to journal10.2196/49975