Psychometric testing of the Norwegian version of the Expanded Prostate Cancer Index Composite 26-item version (EPIC-26).

Objectives: In patients with prostate cancer, evaluation of quality of care requires the inclusion of patient-reported outcomes measures assessed by validated and reliable instruments. Basic psychometric tests of the Norwegian version of the Expanded Prostate Cancer Index Composite with 26 items (EPIC-26) were performed in this study.

Material And Methods: Translation of the original questionnaire (University of California, Los Angeles Prostate Cancer Index Composite), field testing and retranslation were done according to published guidelines.