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01-02-2013 | Uitgave 1/2013

Quality of Life Research 1/2013

Construct validity of the EORTC quality of life questionnaire information module

Quality of Life Research > Uitgave 1/2013
Susanne Singer, Philipp M. Engelberg, Gregor Weißflog, Susanne Kuhnt, Jochen Ernst
Belangrijke opmerkingen
Susanne Singer and Philipp M. Engelberg are equal contribution.



Providing sufficient information about diagnosis and treatment is an important feature of high-quality patient care in oncology. To measure patient satisfaction with information received, the European Organisation for Research and Treatment of Cancer Quality of Life Group has recently developed a new tool, the information module (INFO25). The aim of this study was to evaluate the scale structure of the INFO25.


A total of n = 423 patients completed the INFO25 after finishing cancer therapy. The internal consistency of multi-item subscales was calculated using Cronbach’s Alpha. The scale structure was evaluated using multi-trait methods and confirmatory factor analysis.


Cronbach’s Alpha of the multi-item scales ranged from 0.79 to 0.88. Only two items correlated somewhat higher with another scale than with their own, indicating a good scale structure. Construct validity with latent variable models, including a general information factor and four multi-item scales, resulted in the following fit indices CFI = 0.96, RMSEA = 0.08, TLI = 0.99 and WRMR = 1.03.


The suggested construct of the INFO25 with a total score (general factor) in addition to the subscales is valid.

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