Abstract
Objective: In this study, we aimed to develop a five-level grading system (CS-30 grade) for the 30-second chair stand test (CS-30) in older outpatients, stratified by age and sex, and assess its validity through its association with the Kihon Checklist (KCL).
Methods: In total, 1,753 outpatients aged ≥65 years were classified into five newly developed CS-30 grades based on age- and sex-specific percentiles. Association between the CS-30 grades and KCL classification was analyzed using the chi-square and Cochran–Armitage trend tests.
Results: The newly developed CS-30 grades showed a distribution wherein the majority of patients were classified into grade 3, and lower grades became increasingly prevalent with advancing age. We observed a significant association between the CS-30 grades and KCL classification. The proportion of individuals classified as frail decreased progressively with higher CS-30 grades.
Conclusion: The newly developed CS-30 grading system reflects the current physical functioning of older outpatients and may serve as a practical tool for stratifying frailty and supporting early screening. Further investigation is warranted to confirm its clinical utility in the community and clinical settings.
