Abstract
Background: Colorectal cancer and its treatments can have a detrimental effect on patients’ quality of life. The European Organization for Research and Treatment of Cancer Quality of Life questionnaire (EORTC-QLQ) was developed to assess quality of life among colorectal cancer patients and is used worldwide. However, the tool has not been translated into a local language or validated in the Ethiopian context. Therefore, this study aimed to examine the psychometric properties of the EORTC-QLQ in Ethiopia among colorectal cancer patients.Methods: A cross-sectional study was conducted in a major referral hospital in Addis Ababa, Ethiopia from March to May, 2020. A total of 158 colorectal cancer patients were consecutively included. The construct validity was assessed using Multitrait Scale Analysis, convergent validity, and relationship with functional outcomes. The internal consistency was examined using Cronbach’s alpha.Result: Among the participants, 52.2% were men, with a median age of 46 years (IQR = 17.7 years). The time needed to complete the EORTC-QLQ was less than 20 minutes. The item-total correlation alpha values ranged from 0.47–0.91. All item correlations within their scales were greater than 0.4 except for the Blood and Mucus in Stool scale. The value of correlation coefficients between all items and their own domain were higher than other domains, except for the Blood and Mucus in Stool scale. The correlation between the core questionnaire and the colorectal tool ranged from -0.453–0.581. The tool showed a significant difference between stoma and non-stoma patients, and between patients who had good physical function and those who did not.Conclusion: Except for the Blood and Mucus in Stool scale, the construct validity and reliability of all scales were supported. Therefore, the Amharic version of the tool can be used to assess health related quality of life in Ethiopian colorectal cancer patients. However, due to the low correlation between items in the Blood and Mucus in Stool scale, we recommend that these items are treated as a single item.