Discriminant and convergent validity of the GSRS‐IBS symptom severity measure for irritable bowel syndrome: A population study

Background The Gastrointestinal Symptom Rating Scale–Irritable Bowel Syndrome (GSRS‐IBS) is a 13‐item measure of IBS symptom severity. The scale has been used in several studies, but its psychometric properties have been insufficiently investigated and population‐based data are not available. Objective The objective of this article is to establish the factor structure and discriminant and convergent validity of the GSRS‐IBS. Methods The study...