Table 2 Duodenal adenoma distribution according to Spigelman score at the first and last endoscopies

Spigelman score

Number of polyps

0 points

1 point: 1–4

2 points: 5–20

3 points: >20

72 (48)

19 (13)

18 (12)

42 (28)

22 (15)

28 (19)

26 (18)

70 (48)

< 0.001

Polyp size

0 points

1 point: 1–4 mm

2 points: 5–10 mm

3 points: >10 mm

72 (48)

29 (19)

43 (28)

7 (5)

22 (15)

42 (29)

45 (31)

37 (25)

< 0.001

Histology

0 points

1 point: tubular

2 points: tubulovillous

3 points: villous

72 (48)

79 (52)

0 (0)

0 (0)

22 (15)

124 (85)

0 (0)

0 (0)

< 0.001

Dysplasia

0 points

1 point: mild

2 points: moderate

3 points: severe

72 (48)

47 (31)

30 (20)

2 (1)

22 (15)

42 (29)

50 (34)

32 (22)

< 0.001

Spigelman stage

0

I: 1–4 points

II: 5–6 points

III: 7–8 points

IV: 9–12 points

72 (48)

11 (7)

22 (15)

43 (28)

3 (2)

22 (15)

4 (3)

40 (27)

54 (37)

26 (18)

< 0.001