Journal of the Medical Association of Thailand · Mar 21, 2026

Test-Retest Reliability of the Five-Times Sit-to-Stand Test in Sedentary Community-Dwelling Older Adults in Thailand

By Kaewjoho C, Srithawong A, Suwannakul B et al.

Objective: To examine the test-retest, intra-rater, and inter-rater reliability of the five-times sit-to-stand test (FTSST) among sedentary community-dwelling older adults when administered by a licensed physical therapist and a trained village health volunteer (VHV). Materials and Methods: The cross-sectional study included 34 sedentary community-dwelling older adults aged 60 years or older. The FTSST was administered in two sessions one week apart by an experienced physical therapist and a VHV. Test-retest, intra-rater, and inter-rater reliability were evaluated using intraclass correlation coefficients (ICC), standard error of measurement (SEM), and minimal detectable change (MDC). Results: The FTSST showed excellent reliability across all assessments, with ICC values ranging from 0.920 to 0.958. SEM ranged from 0.409 to 0.554 seconds (4.00% to 5.43%) and MDC ranged from 1.133 to 1.537 seconds (11.10% to 15.05%). The agreement between the physical therapist and the VHV was high, indicating consistent test performance. Conclusion: The FTSST shows good reliability in sedentary older adults, and that administration by trained VHV is feasible in community settings.

doi.org/10.35755/jmedassocthai.2026.3.03141Open accessBiomarkers