Use of item response theory to develop a shortened version of the EORTC QLQ-C30 emotional functioning scale.
Qual Life Res
; 13(10): 1683-97, 2004 Dec.
Article
em En
| MEDLINE
| ID: mdl-15651539
ABSTRACT
BACKGROUND:
As part of a larger study whose objective is to develop an abbreviated version of the EORTC QLQ-C30 suitable for research in palliative care, analyses were conducted to determine the feasibility of generating a shorter version of the 4-item emotional functioning (EF) scale that could be scored in the original metric.METHODS:
We used data from 24 European cancer studies conducted in 10 different languages (n = 8242). Item selection was based on analyses by item response theory (IRT). Based on the IRT results, a simple scoring algorithm was developed to predict the original 4-item EF sum scale score from a reduced number of items.RESULTS:
Both a 3-item and a 2-item version (item 21 'Did you feel tense?' and item 24 'Did you feel depressed?') predicted the total score with excellent agreement and very little bias. In group comparisons, the 2-item scale led to the same conclusions as those based on the original 4-item scale with little or no loss of measurement efficiency.CONCLUSION:
Although these results are promising, confirmatory studies are needed based on independent samples. If such additional studies yield comparable results, incorporation of the 2-item EF scale in an abbreviated version of the QLQ-C30 for use in palliative care research settings would be justified. The analyses reported here demonstrate the usefulness of the IRT-based methodology for shortening questionnaire scales.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Qualidade de Vida
/
Indicadores Básicos de Saúde
/
Neoplasias
Tipo de estudo:
Clinical_trials
/
Etiology_studies
/
Prognostic_studies
/
Qualitative_research
/
Risk_factors_studies
Aspecto:
Determinantes_sociais_saude
/
Patient_preference
Limite:
Adult
/
Aged
/
Humans
/
Male
/
Middle aged
País/Região como assunto:
Europa
Idioma:
En
Revista:
Qual Life Res
Assunto da revista:
REABILITACAO
/
TERAPEUTICA
Ano de publicação:
2004
Tipo de documento:
Article
País de afiliação:
Estados Unidos