The EORTC QLQ-ELD14 questionnaire for elderly cancer patients. Validation study for elderly Spanish breast cancer patients.

BACKGROUND AND OBJECTIVES:Quality of life (QoL) is a key outcome for elderly cancer patients. The EORTC has developed QLQ-ELD14, a questionnaire that assesses important age-specific issues for older patients with cancer. This study aims to validate QLQ-ELD14 for use with elderly Spanish breast cancer patients. MATERIALS AND METHODS:A consecutive sample of breast cancer patients with localized disease (age ≥65) who had received surgery ≥5 years earlier, were disease-free, and may have received adjuvant treatments was included. Patients completed the QLQ-ELD14, QLQ-C30 and QLQ-BR23 questionnaires. A subsample of patients completed QLQ-ELD14 six months later. Psychometric evaluation of the structure, reliability and validity of QLQ-ELD14 was conducted. RESULTS:87 patients completed the first assessment and 30 the second. Multitrait scaling analysis showed that all items except two met the standards for convergent and divergent validity. Cronbach's coefficient met the 0.7 alpha criterion on all scales except worries about others. Areas of QLQ-ELD14 and QLQ-C30 whose contents are conceptually related correlated substantially (Spearman's Rho >0.40). Conversely, areas of QLQ-ELD14 that had less in common with those of QLQ-C30 and QLQ-BR23 had low correlations (Spearman's Rho <0.1). Differences in QLQ-ELD14 were found in groups based on age, disease duration, living arrangement, presence of limiting comorbidity, and level of performance status. Patients had a higher level of worries at the second assessment. CONCLUSIONS:QLQ-ELD14 is a reliable and valid instrument when applied to a sample of Spanish patients. Our results are in line with those of other validation studies.