Table 1

 Self-report information used to determine caseness groupings for irritable bowel syndrome

SymptomRome I criteriaRome II criteria
✓ criterion included under the Rome I or Rome II diagnoses.
Two or more of the following abdominal pain-related symptoms:
    Relief from pain after bowel movement
    More frequent bowel movements with pain
    Less frequent bowel movements with pain
    Pain-related loose/watery stools
    Pain-related hard/lumpy stools
One or more pain-related symptoms as above
Two or more of the following symptoms of disturbed defecation at least 25% of the time
    Abnormal stool frequency
    Abnormal stool form
    Abnormal stool passage
    Abdominal bloating
    Mucus in stools
At least 3 months of disturbed bowel function