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

Chonticha Kaewjoho, PhD¹, Arunrat Srithawong, MSc¹, Boonsita Suwannakul, PhD¹, Puttipong Poncumhak, PhD¹, Patchareeya Amput, PhD¹, Tichanon Promsrisuk, PhD², Atchara Intasuwan, BSc³

Affiliation : ¹ Department of Physical Therapy, School of Allied Health Sciences, University of Phayao, Phayao, Thailand; ² Division of Physiology, School of Medical Sciences, University of Phayao, Phayao, Thailand; ³ Dongjen Health Promotion Hospital, Phu Kam Yao, Phayao, Thailand

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.

Received 17 June 2025 | Revised 9 January 2026 | Accepted 19 January 2026
DOI: 10.35755/jmedassocthai.2026.3.03141

Keywords : Reliability; Sedentary behavior; Village health volunteer; Functional mobility; Older adults


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