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IBS symptom retention (Changed to IBS). In the group that progressed to IBS, 15 cases (11 diarrhea-predominant type, 4 constipation-predominant type) had IBS symptoms for two years or more, 12 cases (10 diarrhea-predominant type, 2 constipation-predominant type) for one year or more, and 10 cases (7 diarrhea-predominant type, 3 constipation-predominant type) for less than one year.
