Development, content validation and reliability assessment of the Bowel Irrigation Questionnaire, a Patient-Reported Experience Measure for Transanal Irrigation: a multi-methods study

The 16-item Bowel Irrigation Questionnaire (BIQ) for transanal irrigation (TAI) shows strong temporal stability, with test-retest exact agreement of 83.9% to 100% across items.

• Why it matters: Clinicians lack a patient-reported experience measure that captures TAI users’ experience, and early evidence is needed for content validity and temporal stability before clinical use.
• What they did: The BIQ was developed via literature review, qualitative interviews, a three-round international Delphi with consensus, cognitive interviews, and QQ-10; 32 UK TAI users completed BIQ twice.
• The result: QQ-10 median burden and value scores were 0 (IQR 0–2.3) and 21 (IQR 19–22.5), and 100% agreement within one response category for every item supports acceptability, pending further psychometric testing.

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