title: Construct validity of the EORTC quality of life questionnaire information module.
abstract: OBJECTIVE
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  The suggested construct of the INFO25 with a total score (general factor) in addition to the subscales is valid.
authors.affiliation: Department of Medical Psychology and Medical Sociology, University of Leipzig, Philipp-Rosenthal-Str. 55, 04103, Leipzig, Germany. susanne.singer@medizin.uni-leipzig.de
authors.forename: Susanne
authors.initials: S
authors.lastname: Singer
authors.forename: Philipp M
authors.initials: PM
authors.lastname: Engelberg
authors.forename: Gregor
authors.initials: G
authors.lastname: Weißflog
authors.forename: Susanne
authors.initials: S
authors.lastname: Kuhnt
authors.forename: Jochen
authors.initials: J
authors.lastname: Ernst
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005163:Factor Analysis, Statistical; D005260:Female; D005833:Genital Neoplasms, Female / Q000523:psychology* / Q000628:therapy; D005858:Germany; D006801:Humans; D008297:Male; D008875:Middle Aged; D017060:Patient Satisfaction; D011594:Psychometrics / Q000295:instrumentation*; D011788:Quality of Life; D015203:Reproducibility of Results; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires / Q000592:standards*; D014571:Urologic Neoplasms / Q000523:psychology* / Q000628:therapy; D055815:Young Adult