Development of Computerised Adaptive Testing (Cat) for the Eortc Qlq-C30 Dimensions - General Approach and Initial Results for Physical Functioning
Resource
EUROPEAN JOURNAL OF CANCER v.46 n.8 pp.1352-1358
Journal
EUROPEAN JOURNAL OF CANCER
Journal Volume
v.46
Journal Issue
n.8
Pages
1352-1358
Date Issued
2010
Date
2010
Author(s)
CHIE, WEI-CHU
Abstract
Background: Health-related quality of life (HRQOL) questionnaires should ideally be adapted to the individual patient and at the same time scores should be directly comparable across patients. This is achievable using a computerised adaptive test (CAT). Basing the CAT on an existing instrument enables measurement within an established HRQOL framework and allows backward- compatibility with studies using the original instrument. Because of these advantages the EORTC Quality of Life Group( QLG) has initiated a project to develop a CAT version of the widely used EORTC QLQ- C30. Methods: We present the EORTC QLG's strategy for developing a CAT. For each dimension of the EORTC QLQ-C30 our approach includes literature search and conceptualisation, formulation of new items, expert and patient evaluations, field-testing, and psychometric analyses of the items. The strategy is illustrated with the initial results of the development of CAT for physical functioning (PF). Results: We identified 975 PF items in the literature. Of these, 407 items were deemed relevant, i.e. measured one of the PF aspects measured by the QLQ-C30. Based on these items we developed 86 new items. Review by the EORTC CAT-project group reduced this to 66 items. Based on expert and patient evaluations several items were revised and the list was further reduced to 51 items. Conclusions: Based on the findings for PF, we believe that our approach will generate item pools that are relevant and appropriate for cancer patients. These will form the basis for a backward-compatible CAT assessing the HRQOL dimensions of the EORTC QLQ-C30.
Subjects
Computerised adaptive test
EORTC QLQ-C30
Item response theory
Item banking
Quality of life
SDGs
Type
journal article