Discriminant and convergent validity of the GSRS-IBS symptom severity measure for irritable bowel syndrome: A population study.
Brjánn LjótssonMichael P JonesNicholas J TalleyLars KjellströmLars AgréusAnna AndreassonPublished in: United European gastroenterology journal (2020)
The GSRS-IBS total score and subscales have high discriminant and convergent validity. The CFA confirmed the overall validity of the subscales but suggest that a sense of incomplete emptying belongs to the constipation rather than the diarrhea symptom cluster. We conclude that the GSRS-IBS is an excellent measure of IBS symptom severity in the general population.