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Due to our limited understanding of their pathogenesis, functional bowel disorders remain largely a diagnosis of exclusion.

This must be undertaken in the following ways: External companies/collaborators wishing to produce translations/adaptations of the ICIQ or its modules must gain prior permission from the ICIQ Development Group (contact Nikki Gardener).

The questionnaire was designed to measure the following constructs: child personal factors; parental support and self-efficacy for providing support; parental rules and restrictions; maternal attitudes and perceptions; maternal behaviour; barriers to physical activity; and the home and local environments. Study I included 24 mothers of four-year-old children who completed the questionnaire then participated in a telephone interview covering similar items to the questionnaire.

To assess validity, the agreement between interview and questionnaire responses was assessed using Cohen's kappa and percentage agreement.

This is a review article which comprehensively explores and describes the validity and reliability of a research instrument (with special reference to questionnaire).

It further discusses various forms of validity and reliability tests with concise examples and finally explains various methods of analysing these tests with scientific principles guiding such analysis.

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