Translation, cross-cultural adaptation, and validation of the Thai version of the Hot Flash–related Daily Interference Scale (Thai HFRDIS)

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OBJECTIVE: To translate, culturally adapt, and validate the Thai Hot Flash-related Daily Interference Scale for assessing interference from vasomotor symptoms. METHODS: In this cross-sectional psychometric validation study, the Hot Flash-related Daily Interference Scale was translated using forward-backward translation, expert review, and cognitive debriefing. Women in the menopause transition or postmenopause at the menopause clinic in Bangkok completed the Thai Hot Flash-related Daily Interference Scale, the Thai Menopause Rating Scale, and the Thai Menopause-Specific Quality of Life questionnaire. Psychometric evaluation included content validity, structural validity, internal consistency, test-retest reliability using the intraclass correlation coefficient, construct validity evidence, floor and ceiling effects, and exploratory receiver operating characteristic analyses to support score interpretation. RESULTS: Of 336 enrolled women, 330 were analyzed (164 symptomatic and 166 asymptomatic controls). Content validity was high (scale-level content validity index=0.960). Reliability was excellent (Cronbach's alpha=0.963; intraclass correlation coefficient=0.981; 95% CI: 0.971-0.987). Factor analyses supported a predominantly unidimensional structure. Construct validity evidence was supported by a strong correlation with the vasomotor domain of the Thai Menopause-Specific Quality of Life Questionnaire (Spearman's correlation coefficient=0.716; P

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