Table 2.

Characteristics of patients entering the study on duodenal adenomatous polyposis

N (male/female)	32 (16/16)
Age at colectomy-years (median and range)	28 (9–52)
Age when starting upper digestive tract screening-years median and range)	38 (13–65)
Age at last upper digestive tract screening-years (median and range)	50 (25–80)
Age at censory date (January 1 2009) (N = 27)-years (median and range)	52.0 (33–81)
Positive family history N (%)	24 (75)
APC mutation known N (%)	19 (59.4)
First operation
Subtotal colectomy and ileorectal anastomosis (IRA) N (%)	20 (62.5)
Proctocolectomy with ileal pouch anal anastomosis (IPAA) N (%)	11 (34.4)
Proctocolectomy with ileostoma N (%)	1 (3.1)
Operation status in 2009 N (%)
Subtotal colectomy and ileorectal anastomosis (IRA) N (%)	11 (34.4)
Proctocolectomy with ileal pouch anal anastomosis (IPAA) N (%)	13 (40.6)
Proctocolectomy with ileostoma N (%)	8 (25.0)
Total number of endoscopies N	210
Number of endoscopies per patient (median and range)	6.5 (2–17)
Fundic glands present N (%)	23 (71.9)
Total follow-up in years (median and range)	19.5 (8–28)
Interrupted study due to endoscopic intervention N (%)	10 (31.3)
Interrupted study due to death N (%)	5 (15.6)
Participant of DAF study N (%)	8 (25.0)