Dutch-Flemish translation and validation of the gastrointestinal symptom scales from the patient‑reported outcomes measurement information system (PROMIS).

Purpose: To translate the eight PROMIS GastrointestinaI Symptom Scales into Dutch-Flemish and to evaluate their psychometric properties.

Methods: This study consisted of two parts: (1) translation according to the Functional Assessment of Chronic Illness Therapy (FACIT) translation methodology and (2) evaluation of psychometric properties: structural validity, using confirmatory factor analysis; and construct validity using hypothesis testing.

Results: In the first part of the study, in 19 out of the 77 items (24.