Table 1 Patients’ baseline characteristics

Age at first endoscopy, years

30 (16–76)

Sex, male

65 (43)

Body mass index, kg/m²

21.0 (14.7–37.2)

Alcohol intake

Past/current drinker

Never-drinker

74 (49)

77 (51)

Smoking

Past/current smoker

Never-smoker

36 (24)

115 (76)

Family history of FAP

Positive

Negative

Unknown

130 (86)

8 (5)

13 (9)

Helicobacter pylori status

Positive

Negative

Unknown

Age at diagnosis of FAP, years

29 (19)

115 (76)

7 (5)

26 (13–64)

History

Colorectal cancer

Colorectal surgery

11 (7)

49 (32)

FAP classification

Classic FAP

Attenuated FAP

138 (91)

13 (9)

Ampullary adenoma

Positive

Negative

22 (15)

130 (86)

Data are presented as median (range) or n (%).

FAP, familial adenomatous polyposis