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.