Table 2. Univariate analysis of risk factors for delayed colonic postpolypectomy hemorrhage.
| non- hemorrhagic group | hemorrhagic group | P Value (2-sided) | |
| Endoscopic experience # | 2922(5000) | 2466(3505) | 0.133 |
| Polyp location 1 (%) | 0.30 | ||
| Left hemi-colon | 11010/14819 (74.3) | 78/99 (78.8) | |
| Right hemi-colon | 3809/14819 (25.7) | 21/99 (21.2) | |
| Polyp location 2 (%) | 0.90 | ||
| Appendix | 689/14880 (4.6) | 3/99 (3.0) | |
| Hepatic flexure | 309/14880 (2.1) | 2/99 (2.0) | |
| Splenic flexure | 61/14880 (0.4) | 0/99 (0.0) | |
| Rectum | 3971/14880 (26.7) | 28/99 (28.3) | |
| Colon | 9850/14880 (66.2) | 66/99 (66.7) | |
Polyp size
|
8.8(7.8) | 19.0(13.2) | 0.000 |
| Polyp pathology (%) | 0.000 | ||
| Inflammatory/hyperplastic | 4792/12942(37.0) | 12/92(13.0) | |
| Adenomatous | 7323/12942 (56.6) | 66/92 (71.7) | |
| Serrated | 338/12942 (2.6) | 1/92 (1.1) | |
| Juvenile | 218/12942 (1.7) | 9/92 (9.8) | |
| Peutz-Jehger | 271/12942 (2.1) | 4/92 (4.3) | |
| Atypia (%) | 0.000 | ||
| Mild | 4484/13748 (32.6) | 27/91 (29.7) | |
| Moderate | 1856/13748 (13.5) | 19/91 (20.9) | |
| Severe | 798/13748 (5.8) | 15/91 (16.5) | |
| Canceration | 120/13748 (0.9) | 3/91 (3.3) | |
| No atypia | 6490/13748 (47.2) | 27/91 (29.7) | |
| Polypectomy methods (%) | 0.000 | ||
| Snare polypectomy | 7431/14794(50.2) | 76/99(76.8) | |
| EMR | 1542/14794 (10.4) | 15/99 (15.2) | |
| EPMR | 81/14794 (0.5) | 6/99 (6.1) | |
| APC | 2989/14794 (20.2) | 1/99 (1.0) | |
| Biopsy forcep | 2049/14794 (13.9) | 0/99 (0.0) | |
| Hot biopsy forcep | 702/14794 (4.7) | 1/99 (1.0) | |
| Immediate postpolypectomy bleeding (%) | 256/15467(1.7) | 11/99 (11.1) | 0.000 |
#
, median (interquartile range);
, mean (standard deviation).