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Table 1 The Rome III diagnostic criteria for defining chronic constipation

From: Defining constipation to estimate its prevalence in the community: results from a national survey

Rome III Diagnostic Criteria [11]
Diagnostic criteriaa
1. Must include two or more of the following:
 a. Straining during at least 25% of defaecations
 b. Lumpy or hard stools in at least 25% of defaecations
 c. Sensation of incomplete evacuation for at least 25% of defaecations
 d. Sensation of anorectal obstruction/blockage for at least 25% of defaecations
 e. Manual manoeuvres to facilitate at least 25% of defaecations (e.g. digital evacuation, support of the pelvic floor)
 f. Fewer than 3 defaecations per week.
2. Loose stools are rarely present without the use of laxatives
3. Insufficient criteria for irritable bowel syndrome
  1. aCriteria fulfilled for the last 3 months with symptom onset at least 6 months prior to diagnosis