Comparison of various risk factors with outcome
| Groups | Risk factors (N) | N | Adverse outcome | Odds ratio (95% CI) | p Value |
| Polyp shape | 3-151Sessile v pendunculated | 19v 51 | 10 v 9 | 8.3 (2.1 to 34.8) | <0.001 |
| Polypectomy | Incomplete vcomplete | 8 v 62 | 6 v 10 | 15.6 (2.2 to 169) | 0.001 |
| 3-150Margin of resection | Not cancer-freev cancer-free | 24 v 38 | 9 v1 | 20.2 (2.6 to 998) | <0.001 |
| 3-150Lymphatic invasion | 3-151Present v not present | 6 v 56 | 4v 6 | 16.7 (1.8 to 204) | 0.005 |
| 3-150Venous invasion | 3-151Present v not present | 5 v57 | 2 v 8 | 4.1 (0.3 to 40.7) | 0.18 |
| 3-150Grade III cancer | 3-151Present v not present | 5 v57 | 2 v 57 | 4.1 (0.3 to 40.7) | 0.18 |
| 3-150Polypoid cancer | 3-151Present v not present | 6v 56 | 3 v 7 | 7 (0.7 to 60.6) | 0.048 |
| Risk categories | High risk v low risk | 38v 32 | 16 v 0 | Infinite (5 to infinite) | <0.001 |
The odds ratio for an adverse outcome is given regardless of the presence or absence of various risk factors.
↵3-150 Eight of the 70 malignant polyps had incomplete or piecemeal resection; as their histological features could not reliably be determined, they were excluded from this analysis.
↵3-151 These risk factors had only an adverse outcome in combination with other risk factors.