การศึกษาความเที่ยงตรงและความเชื่อมั่นของแบบประเมิน Functional Assessment Staging Test (FAST) ฉบับภาษาไทยในผู้ป่วยโรคสมองเสื่อม

Parichart Piasupun; Rattanaporn Siriket; Samunya Khanrugsa; Attakorn Raksattya; Panita Limpawattana

doi:10.64960/srimedj.v41i2.270278

Authors

Parichart Piasupun Nursing Division, Srinagarind Hospital, Faculty of Medicine, Khon Kaen University
Rattanaporn Siriket Nursing Division, Srinagarind Hospital, Faculty of Medicine, Khon Kaen University
Samunya Khanrugsa Nursing Division, Srinagarind Hospital, Faculty of Medicine, Khon Kaen University
Attakorn Raksattya Karunruk Palliative Care Center, Srinagarind Hospital, Faculty of Medicine, Khon Kaen University
Panita Limpawattana Division of Geriatric Medicine, Internal Medicine Department, Faculty of Medicine, Khon Kaen University.

DOI:

https://doi.org/10.64960/srimedj.v41i2.270278

Keywords:

dementia severity staging, end-stage dementia care, Thai assessment tool, inter-rater reliability

Abstract

Background and objective: The Functional Assessment Staging Test (FAST) is an internationally validated tool for evaluating the severity of Alzheimer's disease — the most common cause of dementia — across 7 stages and 16 sub-levels. This study aimed to translate and examine the content validity and inter-rater reliability of the Thai version of the FAST.

Methods: The translation process followed ISPOR guidelines, comprising forward translation, review by three experts, back-translation by two specialists, and inter-rater reliability testing by two raters in 30 patients with dementia at Srinagarind Hospital between August 2024 and January 2025. Data were analyzed using the Content Validity Index (CVI) and Intraclass Correlation Coefficient (ICC).

Results: The Thai version of the FAST demonstrated a CVI of 0.89 and an ICC of 0.995 (95% CI: 0.990–0.997, p < 0.001). The majority of patients were classified in FAST stages 6–7 (90.0%).

Conclusion: The Thai version of the FAST demonstrates excellent content validity and inter-rater reliability, making it suitable for staging dementia in the Thai context — particularly in patients with advanced disease — to support prognosis, care planning, and timely referral to palliative care.

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