Article

The comparability of quality of life scores: a multitrait multimethod analysis of the EORTC QLQ-C30, SF-36 and FLIC questionnaires

Department of Oncology and Hematology, Universitatsklinikum Charite, Humboldt Universitat, 10098, Berlin, Germany.
European Journal of Cancer (Impact Factor: 4.82). 03/2002; 38(3):339-48.
Source: PubMed

ABSTRACT This study investigates whether similarly named subscales of three quality of life questionnaires, the European Organization for Research and Treatment of Cancer Quality of Life Core Questionnaire (EORTC QLQ-C30), the Medical Outcome Study Quality of Life Questionnaire Short Form 36 (SF-36) and the Functional Living Index Cancer questionnaire (FLIC) assess similar aspects of the patients' quality of life. A multitrait multimethod analysis on the answers of 234 cancer patients showed that subscale correlations as indicators of convergent validity significantly exceed corresponding correlations of discriminant validity in five of the seven dimensions analysed (physical functioning, emotional functioning, pain, fatigue/vitality and nausea/vomiting). The results of the social functioning and overall health subscales are less clear. Content analysis of the social functioning scales reveals that this domain is differently operationalised in the three questionnaires. Linear regressions of the overall health subscales suggest that patients interpret overall health questions of the three questionnaires differently. The results show that overall health subscales of these three questionnaires cannot be equated, while most specific subscales provide valid results.

Download full-text

Full-text

Available from: Corinna Langelotz, Sep 05, 2015
1 Follower
 · 
108 Views
 · 
96 Downloads
  • Source
    • "Similar results have been reported elsewhere [16–29]. Possible explanations might be that the two instruments operationalize the HRQoL construct differently [43], or perhaps artefacts from the translation from English to Greek. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Objectives. The aim of this study was to assess the psychometric properties of the Greek EORTC QLQ-C30 and QLQ-MY20 instruments. Method. A sample of myeloma patients (N = 89) from two tertiary hospitals were surveyed with the QLQ-C30, QLQ-MY20 and various demographic and disease related questions. The previously validated Greek SF-36 instrument was used as a "gold standard" for health-related quality of life (HRQoL) comparisons. Hypothesized scale structure, internal consistency reliability (Cronbach's alpha) and various forms of construct validity (convergent, discriminative, concurrent and known-groups) were assessed. Results. Multitrait scaling confirmed scale structure of the QLQ-C30 and QLQ-MY20, with good item convergence (96% and 72%) and discrimination (78% and 58%) rates. Cronbach's α was >0.70 for all but one scale (cognitive functioning). Spearman's correlations between similar QLQ-C30 and SF-36 scales ranged between 0.35-0.80 (P < 0.001). Expected interscale correlations and known-groups comparisons supported construct validity. QLQ-MY20 scales showed comparatively lower correlations with QLQ-C30 functional scales, and higher correlations with conceptually related symptom scales. Conclusions. The observed psychometric properties of the two instruments imply suitability for assessing myeloma HRQoL in Greece. Future studies should focus on generalizability of the results, as well as on specific issues such as longitudinal validity and responsiveness.
    The Scientific World Journal 08/2012; 2012(1):842867. DOI:10.1100/2012/842867 · 1.73 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The objective of this study was to test the reliability and validity of the Taiwan Chinese version of the EORTC QLQ-C30 (version 3) and EORTC QLQ-BR23. The authors followed the guidelines of translation and pilot testing of the questionnaires. The questionnaires were given to 35 breast cancer patients under active treatment and 54 under follow-up at the National Taiwan University Hospital from November 2000 to October 2001. A retest was conducted one to two weeks after the first interview/form completion for the follow-up group. The intraclass correlation coefficients of the two questionnaires were moderate to high in the follow-up group. The Cronbach's alpha coefficients of most scales of the two questionnaires were > or = 0.70 except that of physical functioning (0.68), cognitive functioning (0.53), and arm symptoms (0.59). Correlations of scales measuring similar dimensions of the EORTC QLQ-C30 and the SF-36 were moderate. Patients in the active treatment group had more serious QOL problems due to disease and treatment. Results of this study showed that the Taiwan Chinese version of the two questionnaires had good test/retest reliability, high internal consistency in most scales, and could show the expected differences between patients in active chemotherapy and follow-up group.
    Psycho-Oncology 10/2003; 12(7):729-35. DOI:10.1002/pon.727 · 4.04 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Palliative care aims at improving the patient’s quality of life. The assessment of this quality of life (QoL) is crucial for the evaluation of palliative care outcome. Many patients require hospital admissions for symptom control during their cancer journey and most of them die in hospitals, although they would like to stay at home until the end of their lives. In 1986, the European Organization for Research and Treatment (EORTC) initiated a research programme to develop an integrated, modular approach for evaluating the quality of life of patients participating in international clinical trials. This questionnaire measures cancer patients’ physical, psychological and social functions and was used in a wide range of clinical cancer trials with large numbers of research groups and also in various other non-trial studies. The aim of this study was to evaluate the psychometric properties, especially the reliability, validity and applicability of the EORTC QLQ-C30 in a German sample of terminally ill cancer patients receiving palliative care in different settings. The questionnaire was well accepted in the present patient population. Scale reliability was good (pre-treatment 0.80) especially for the functional scale. The results support the reliability and validity of the QLQ-C30 (version 3.0) as a measure of the health-related quality of life in German cancer patients receiving palliative care treatment.
    Central European Journal of Medicine 09/2009; 4(3):348-357. DOI:10.2478/s11536-009-0032-7 · 0.21 Impact Factor
Show more