Background Frailty is a predictor of adverse outcomes in older adults, yet contemporary Portuguese‐language tools for standardized frailty assessment remain limited. We translated, culturally adapted, and evaluated the updated clinical frailty scale (CFS, v2.0) for Brazilian Portuguese. Objectives To assess inter‐ and intrarater reliability and convergent validity of the updated CFS in hospitalized older adults. Methods This cross‐sectional psychometric study included patients aged 65 years or older admitted for elective surgery. Following a standardized cross‐cultural adaptation process, two independent examiners administered the updated Brazilian Portuguese CFS 60 min apart to assess inter‐rater reliability. Intrarater reproducibility was evaluated after 24 h. Participants also completed the SF‐36 quality‐of‐life questionnaire to examine convergent validity. Results Ninety‐four hospitalized older adults were included. Inter‐rater reliability was excellent (ICC2, 1 = 0.92, 95% CI 0.88–0.95). Weighted Cohen’s kappa indicated almost perfect ordinal agreement (κw = 0.96, 95% CI 0.83–1.00). Measurement error was low (SEM = 0.44; MDC95 = 1.22). Convergent validity was strong, demonstrating a significant monotonic association between CFS scores and SF‐36 domains (Spearman’s ρ = −0.786, p < 0.01). Exploratory descriptive analyses were conducted to illustrate the clinical context of frailty classification in this sample. These observations were not intended to assess predictive validity or support confirmatory inference. Conclusion The updated Brazilian Portuguese version of the CFS demonstrates excellent reproducibility and strong convergent validity in hospitalized older adults. These results support its use as a reliable clinical and research tool for frailty assessment in hospitalized older adults, within the scope of the measurement properties evaluated.
Rodrigues et al. (Thu,) studied this question.