Table 4

Data used for the decision analysis

• Risk proctectomy rectal cancer by age 65=0.26

• Risk proctectomy other reasons by age 65=0.34

• Mean age proctectomy for rectal cancer=45 years

• Mean age proctectomy for other reasons=36 years

• Perioperative mortality=0.00532

• Risk local rectal cancer=0.61

• Risk metastatic rectal cancer=0.39

• 10 year survival local rectal cancer=0.90

• 10 year survival metastatic disease=0.25

• Life expectancy 25 year old FAP patient=45 years

• Risk of pouch excision after IPAA⩽0.0516 33