Table 1 The Rome III diagnostic criteria for defining chronic constipation

Diagnostic criteria^a

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