Progression of duodenal disease according to original Spigelman (Sp) stage
| Original Sp stage | n | Median age (range) | Duodenal cancer | Duodenal cancer risk (CI) | Sp stage progression |
|---|---|---|---|---|---|
| IV | 11 | 58 (29–76) | 4 | 36.4% (15.2, 64.6) | 4 (36.4%) |
| III | 41 | 41 (25–67) | 1 | 2.4% (0.4, 12.6) | 5 (12.2%) |
| II | 44 | 39 (23–67) | 1 | 2.3% (0.4, 11.8) | 7 (15.9%) |
| I | 15 | 34 (14–66) | 0 | 0.0% (0.0, 20.4) | 3 (20%) |
| 0 | 3 | 34 (25–44) | 0 | 0.0% (0.0, 56.2) | 0 (0%) |