Cumulative incidence and risk factors for pouch adenomas associated with familial adenomatous polyposis following restorative proctocolectomy

Table 1 Characteristics of familial adenomatous polyposis patients analyzed in this study

Variable
Age at time of IPAA [yr, median (IQR)]	32 (24-41)
Sex, n (%)
Male	52 (54.7)
Female	42 (45.3)
No. of colorectal polyps [n, median (IQR)]	350 (150-700)
Type of anastomosis, n (%)
Hand-sewn with mucosectomy	72 (75.8)
Double stapling	23 (24.2)
No. of surveillances [n, median (IQR)]
Upper GI endoscopy	5 (2-8)
Sigmoidoscopy	5 (3-7)
Pouch adenomas, n (%)	24 (25.3)
Time to pouch adenoma onset [mo, median (IQR)]	52 (28.3-114.3)
ATZ adenomas, n (%)	7 (7.4)
Gastric polyps, n (%)	70 (73.7)
Duodenal adenomas, n (%)	46 (48.5)
Spigelman stage, n (%)
I	24 (25.3)
II	12 (12.6)
III	10 (10.5)
IV	0
Missing data	49 (51.6)
Desmoid tumors, n (%)	23 (24.2)
Colorectal cancer at time of IPAA, n (%)	43 (45.3)
Colon	24 (55.8)
Rectum	19 (44.2)

IPAA: Ileal pouch anal anastomosis; IQR: Interquartile range; ATZ: Anal transition zone; GI: Gastrointestinal.