<prompt> All of the following are criteria for irritable bowel syndrome except -Change in frequency of stoolBlood mucus in stoolChange in form ofstoolImproves with defecation  <response>: Davidson;s principles and practice of medicine 22nd edition. Romelll criteria. abdominal pain or discomfo associated with 2 or more of the following improvement with defecation change in frequency of stool. change in appearance of stool 