Table 1. Details of the 249 patients with familial adenomatous polyposis who underwent restorative proctocolectomy (RPC), their surgery, and surveillance examinations.

Demographic data
Sex, male, n (%)	131 (53)
Patient age at time of pouch surgery, median (range) [IQR], years	29 (5–66) [22–38]
Number of surveillance examinations, median (range) [IQR]	8 (1–26) [4–14]
Interval between examinations, median (range) [IQR], years	1.50 (0.14–15.93) [1.16–2.23]
First surveillance endoscopy post-surgery
Age of pouch, median (range) [IQR], years	3.49 (0.14–30.85) [1.39–9.91]
Patient age, median (range) [IQR], years	36 (6–77) [29–46]
Last surveillance endoscopy
Age of pouch, median (range) [IQR], years	15.44 (0.14–37.31) [8.45–21.52]
Patient age, median (range) [IQR], years	46 (10–83) [35–56]
Details of surgery
Type of surgery, n (%)
Primary RPC	164 (66)
Secondary RPC	85 (34)
Configuration of pouch, n (%)
J	137 (55)
W	27 (10)
S	1 (< 1)
Kock	2 (< 1)
Unknown	82 (33)
Anastomotic technique, n (%)
Handsewn	72 (48)
Stapled	79 (52)
Unknown	98 (–)
Site of APC pathogenic variant (codon), n (%)
5′ to codon 1249	152 (61)
1250 to 1450	69 (28)
3′ to 1450	20 (8)
Gross deletion	8 (3)

IQR, interquartile range.