International Psychometric Validation Study of the Intestinal Gas Questionnaire (IGQ)

Study Overview
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Brief Summary
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Objective: To confirm the psychometrics properties of the Intestinal Gas Questionnaire (IGQ) in subjects with Irritable Bowel Syndrome (IBS) diagnosis and General population both complaining of Gas-Related Symptoms (GRS). IGQ has been developed previously simultaneously in UK English, French and Spanish through qualitative research with subject interviews. The conceptual framework of the IGQ assesses both GRS and their impact on daily life. Similar concepts were identified for both subjects with IBS diagnosis and general population and complaining of gas-related symptoms. The IGQ consists of a 24-hour recall symptom diary assessing 7 gas-related symptoms (17 items) and a 7-day recall questionnaire which assesses the impact of those symptoms (26 items)

Detailed Description
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Observational (non-interventional) study with a cross-sectional part for a subset of adult subjects with a single IGQ completion and a longitudinal cross-over part for a subset of subjects with test-retest IGQ completion for validation of electronic version of IGQ. 300 eligible subjects (100 in each of the 3 countries: France, UK & Spain): 180 with IBS diagnosis (60% of recruited subjects) 120 from General population (40% of recruited subjects)

Official Title
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International Psychometric Validation Study of the Intestinal Gas Questionnaire (IGQ)

Conditions
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IBS - Irritable Bowel Syndrome, General Population

Intervention / Treatment
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* Other: completion of self-reported questionnaires


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All (subjects with IBS diagnosis and general population): Complaining of gas-related symptoms (GRS) of a certain severity level: subjects with IBS diagnosis and general population need to report a score of 4 or greater on at least one symptom on the symptom screening tool Cognitive and linguistic capability to complete several self-questionnaires BMI > 18.5 and < 30.0 kg/m2 Agreement of the subject to participate in the study Subjects with IBS diagnosis: IBS diagnosis using Rome III diagnostic criteria for Functional Gastrointestinal Disorders (21) IBS severity: IBS-SSS score of 75 to 300 General population: Subjects not fulfilling IBS Rome III criteria Regular stool frequency (i.e., between 3 and 21 bowel movements per week) Exclusion criteria All (subjects with IBS diagnosis and general population): Recent (2 last weeks) change in diet or intake of potentially flatulogenic compounds (fiber, lactulose) Organic gastrointestinal disease Other functional gastrointestinal disorder as defined by Rome III criteria Any severe and progressive disease (e.g. depression, cancer, uncontrolled diabetes, rheumatoid arthritis…) Any severe psychiatric disorder (e.g. acute episode of schizophrenia or bipolar disorder…) Pregnant women Being under the direct hierarchy of the investigatorBelonging to the site's staff team General population: Treatment for diarrhea or constipation including lactulose

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 75 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| IBS & general population<br>The participants will be given the IGQ questionnaire to complete as well as other self-reported questionnaires. Single completion: Participants will have to complete the IGQ, the generic health status EQ-5D questionnaire, the specific FDDQL questionnaire (Functional Digestive Disorders Quality of Life). Test-retest: during the second completion within a mean 7-day interval, participants will complete the IGQ and a single global Gastro-Intestinal Well-Being scale. | Other: completion of self-reported questionnaires<br>* Single completion: Participants will have to complete the IGQ, the generic health status EQ-5D questionnaire, the specific FDDQL questionnaire (Functional Digestive Disorders Quality of Life). Test-retest: during the second completion within a mean 7-day interval, participants will complete the IGQ and a single global Gastro-Intestinal Well-Being scale<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Psychometric validation of the IGQ | Stastistical analysis to confirm the psychometric validation of the IGQ questionnaire | cross sectional for 70% of participants and test-retest within an interval of 7 days for 30% of participants | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Electronic version of the IGQ | Comparison of scores between paper and electronic version of IGQ | During test-retest within an interval of 7 days | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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IBS, population