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Table 1 The Rome III constipation criteria

From: A descriptive study of colorectal function in adults with Prader-Willi Syndrome: high prevalence of constipation

Criteria (at least 25 % of defecations) Frequency of symptom
Straining during defecation 7/19 (37%)
Lumpy or hard stools 6/19 (32%)
Sensation of incomplete evacuation 3/20 (15%)
Sensation of anorectal obstruction/blockage 8/19 (42%)
Manual manoeuvres to facilitate defecation 0/20 (0%)
Fewer than 3 defecations per week 8/17 (47%)
Loose stools are rarely present without laxatives 3/20 (15%)
Insufficient criteria for IBS (irritable bowel syndrome) 20/20 (100%)