The EORTC QLQ-F17 as a shortened version of the EORTC QLQ-C30 to assess self-reported functioning in cancer patients: investigating equivalence and psychometric properties in a randomized cross-over trial.

ABSTRACT:

Background

The EORTC QLQ-F17, a shortened version of the EORTC QLQ-C30, solely contains the items related to functioning and omits symptom scales. The QLQ-F17 is conceived an equivalent to the functional part of the QLQ-C30, but to date there is no empirical evidence to support this rationale.

Methods

This randomized, cross-over, multi-national, questionnaire-based study investigates the equivalence and psychometric properties of the QLQ-F17 compared to the functional scales of the QLQ-C30. Respondents had to fill in both questionnaires, the order of which was presented in a randomized and balanced manner (QLQ-C30-QLQ-F17 vs. QLQ-F17-QLQ-C30). Equivalence testing used Differential Item Functioning (DIF) and linear models. The margin of equivalence was set at ]-5, 5[ points.

SUBMITTER: Zeman F 

PROVIDER: S-EPMC12167450 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature