Cross-cultural translation and psychometric properties of the Persian version Manchester respiratory activities of daily living questionnaire (MRADLQ-P)

PURPOSE: The present study was an attempt to investigate cross-cultural adaptability and evaluate the psychometric properties of the Persian version of the Manchester respiratory activities of daily living questionnaire ((MRADLQ-P). PATIENTS AND METHODS: In a cross-sectional study, we selected 260 patients with severe respiratory diseases who needed to be admitted to the respiratory wards of this city hospital. The process of cultural localization of the questionnaire was performed based on a standard and valid process. Psychometric properties of the instrument were confirmed based on face and content validity assessments, convergent validity, discriminative validity and internal consistency. Data collected by demographic questionnaire, MRADL questionnaire and work ability index. Data were analyzed by SPSS 22 using descriptive statistics (mean and standard deviation), Spearman correlation coefficient, Cronbach's alpha coefficient, and Mann–Whitney test. RESULTS: The mean age of participants was 48.8 ± 20.1 years. 176 (71.5%) were male. face content validity including content validity index (CVI) was 0.82 and content validity ratio and it was good. The questionnaire was measured at the same time as the work ability index, which Mann–Whitney test showed that the questionnaire has good differential power. Cronbach's alpha coefficient of 0.9 indicates a very good reliability of the questionnaire. CONCLUSION: The results show that intercultural psychometrics of MRADL questionnaire has good validity, reliability, and differential power that can be a good tool for use in future studies. Also, the translation of this checklist included translation into the target language, backward translation of the Persian versions into the original language, and comparisons and ambiguities to obtain a final and acceptable version.