Medical Journal of the Islamic Republic Of Iran

en Measuring Quality of Life in the Speakers with Dysarthria: Reliability and Validity of the Persian Version of the Qol-Dys Speech and Language Therapist Speech and Language Therapist Original Research Original Research     Background: In light of the significance of quality of life in clinical decision-making for patients with dysarthria and the absence of a reliable Persian questionnaire in this field, the objective of the present study was to determine the validity and reliability of the Persian version of the Quality of Life Questionnaire in those diagnosed with dysarthria (QoL-DyS questionnaire), thereby providing a clinically applicable measurement tool.    Methods: The original research involved 70 patients diagnosed with dysarthria, comprising 26 females and 44 males, as well as 70 healthy participants matched to the patient group. After translating the Cultural and Linguistic Adaptation of the QoL-DyS questionnaire into Persian, internal consistency was calculated using Cronbach's alpha coefficient. At the same time, the reliability of the test-retest was evaluated using the intraclass correlation coefficient (ICC). Additionally, the questionnaire's content validity, clinical validity, and criterion validity were calculated.    Results: The questionnaire and all subcategories demonstrated a Cronbach's alpha coefficient exceeding 0.70, and the reproducibility coefficient (ICC) was found to be 0.96 [95% CI, 0.94-0.98]. The content validity ratio (CVR) for all questionnaire items ranged from 0.7 to 1, while the content validity index (CVI) for all items fell between 0.8 and 1. In clinical validity, a significant difference emerged between the mean scores of the patient group and those of the healthy controls (P < 0.000). The criterion validity analysis revealed a satisfactory correlation (r = 0.874, P < 0.000) between the QoL-DyS questionnaire and the Voice Handicap Index questionnaire.    Conclusion: The Persian adaptation of the QoL-DyS questionnaire demonstrates strong validity and reliability. This finding highlights the instrument’s suitability for use by speech-language therapists in evaluating the quality of life of patients experiencing dysarthria.   Quality of life, Dysarthria, Psychometrics, Validity, Reliability, Persian 1242 1252 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-9612-1&slc_lang=en&sid=1 Golnoosh Abaeian abaeian.g@ajums.ac.ir 200319475328460094606 200319475328460094606 No Speech Therapy Department, Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Majid Soltani majidsoltanist@gmail.com 200319475328460094607 200319475328460094607 Yes Speech Therapy Department, Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Negin Moradi negin.moradi@uwrf.edu 200319475328460094608 200319475328460094608 No Department of Communication Sciences and Disorders, University of Wisconsin-River Falls, River Falls, Wisconsin, USA Parvaneh Rahimifar parvane.rahimifar@gmail.com 200319475328460094609 200319475328460094609 No Speech Therapy Department, Rehabilitation Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Saeed Hesam saeed_hesam65@yahoo.com 200319475328460094610 200319475328460094610 No 3. Department of Biostatistics and Epidemiology, Faculty of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran