LAUSR

BACKGROUND AND PURPOSE We aimed to translate the Comprehensive Score of Financial Toxicity (COST) questionnaire into Arabic and to evaluate its reliability and validity. METHODS We applied the four-step translation method and conducted a pilot validation study over 179 medical oncology patients. Reliability was tested using the Cronbach alpha coefficient and test-retest stability. Validity was tested using the correlation with Functional assessment of Cancer Therapy-General score (FACT-G), factorial analysis and the content validity index. RESULTS Questionnaire showed high internal consistency and test retest reliability; Cronbach alpha coefficient was 0.77 and Pearson stability coefficient was 0.8. Convergent validity evaluation showed a statistically significant moderate correlation with the FACT-G (r = .42, p = .047). Content validly index was 0.93. CONCLUSIONS The Arabic version of COST questionnaire, was a valid and reliable tool that could be used in clinical practice by healthcare providers to evaluate financial toxicity in Arab speaking cancer patients.