Psychometric Properties of the Turkish Version of the EORTC QLQ‐ELD14 in Older Patients With Cancer

AIM: The aim of this study was to evaluate the validity and reliability of the Turkish version of the European Organization for Research and Treatment of Cancer (EORTC) QLQ-ELD14 in older patients with cancer. METHODS: One hundred thirteen older patients with cancer were included in the study. The validity and reliability of the EORTC QLQ-ELD14 were evaluated via exploratory and confirmatory factor analyses, correlation analyses with the EORTC QLQ-C30, known-group comparisons, Cronbach's alpha, test-retest and the intraclass correlation coefficient. Known-group comparisons were evaluated in patient groups divided according to cancer stage, Karnofsky performance status and Charlson Comorbidity Index. RESULTS: Factor analysis results demonstrated that the Turkish EORTC QLQ-ELD14, with its seven-factor structure, is a sufficient measurement instrument. Moderate to high correlations were observed between the EORTC QLQ-ELD14 and the QLQ-C30 (r = -0.40 to -0.83; p < 0.05). The clinical validity of the EORTC QLQ-ELD14 has been demonstrated by its ability to discriminate between different clinical profiles. Cronbach's α coefficient was determined to be 0.719. The intraclass correlation coefficients of all subscales were above 0.80. Excellent agreement was observed in test-retest reliability. CONCLUSION: The Turkish version of EORTC QLQ-ELD14 is valid and reliable and is suitable for use by researchers and clinicians.