Abstract
Purpose: Quality of life outcomes are a focal endpoint of cancer treatment strategies which can be evaluated through patient-related outcome measures (PROMs). We aim to validate the Moroccan Arabic version of the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire for Colorectal cancer patients (EORTC QLQ CR-29).Methods: Following translation to Moroccan Arabic, the QLQ CR-29 was administered to patients treated for colorectal cancer (CRC) in the national institute of oncology. Psychometric properties were tested by measuring Cronbach’s alpha coefficient for reliability and Intraclass correlation coefficient(ICC) to examine test-retest reproducibility. The multitrait-scaling analysis was performed to demonstrate the validity of the instrument and the ability to discriminate between different patient groups was tested using known-groups comparison.Results: In total, 221 patients were included in our study and 34 patients completed the questionnaire twice. The urinary Frequency scale and Stool Frequency scale had good internal consistency with alpha Cronbach coefficients of 0,79 and 0,83 respectively, whereas the coefficient was moderately lower for the Blood and Mucus in Stool scale (0,61) and the Body Image scale (0,67). The ICCs ranged from 0,88 to 1 indicating good to excellent reproducibility. In multitrait scaling analyses, the criterion for item convergent and divergent validity was satisfactory. The known-group comparison showed statistically significant differences between patients according to age, gender, stoma status, tumor location, and radiotherapy. Conclusion: The Moroccan Arabic version of the EORTC QLQ-CR29 is a valid and reliable tool and can be used for research and clinical purposes in Moroccan CRC patients.