Validation and reliability of the prosthesis evaluation questionnaire-Thai version for lower-limb amputees

Area of Science:

• Rehabilitation Medicine
• Prosthetics and Orthotics
• Health Outcomes Research

Background:

• Quality of life assessment for lower-limb amputees requires prosthesis-specific outcome measures.
• The internationally recognized Prosthesis Evaluation Questionnaire (PEQ) lacks a culturally adapted Thai version.
• This gap hinders culturally relevant quality of life assessments in Thailand.

Purpose of the Study:

• To translate and culturally adapt the PEQ for Thai lower-limb prosthesis users.
• To evaluate the psychometric properties of the Thai version of the PEQ (PEQ-TH).
• To establish a valid and reliable measure for prosthesis-related quality of life in Thailand.

Main Methods:

• Standard cross-cultural adaptation procedures including translation and back-translation.
• A multidisciplinary expert panel reviewed the translated questionnaire.
• Psychometric evaluation involved content validity, construct validity, internal consistency, test-retest reliability, and floor/ceiling effects in 83 lower-limb amputees.

Main Results:

• PEQ-TH demonstrated strong content validity (item-objective congruence = 0.99).
• Construct validity was supported by correlations with the SF-36 Thai version.
• Acceptable internal consistency (α > 0.70) and moderate to good test-retest reliability (ICC = 0.55–0.76) were observed; no floor/ceiling effects noted.

Conclusions:

• The PEQ-TH is a valid and reliable patient-reported outcome measure for Thai lower-limb amputees.
• It aligns with international standards (ISPO, Camos) for outcome measurement.
• PEQ-TH facilitates culturally relevant assessment and supports patient-centered care.