Ability of the Bristol Impact of Hypermobility questionnaire to discriminate between people with and without Joint Hypermobility Syndrome: a known-group validity study.

The BIoH questionnaire discriminates between those with and without JHS. The median difference (151.5 points) far exceeds the smallest detectable change of 42 points previously identified. The results provide further evidence of the psychometric properties of the BIoH questionnaire and its potential to support research and clinical practice.