Table 1. Clinical characteristics of the 199 investigated adenomas.
| Polypoid Adenomas | Flat Adenomas | |
| Total | n = 93 (%) | n = 106 (%) |
| Histology | ||
| Tubular | 46 (49) | 73 (69) |
| Tubulovillous | 36 (40) | 27 (25) |
| Villous | 10 (11) | 2 (2) |
| Serrated (SSL) | 0 (0) | 3 (3) |
| Serrated (TSA) | 0 (0) | 1 (1) |
| Dysplasia | ||
| LGD (mild) | 11 (12) | 10 (9) |
| LGD (moderate) | 69 (74) | 86 (81) |
| HGD (severe) | 13 (14) | 10 (9) |
| Size (mm) | 17.0 [5–64] | 16.2 [3–100] |
| Male/Female | 41/52 | 66/40 |
| Location | ||
| Proximal | 22 (24) | 69 (65) |
| Distal | 34 (37) | 19 (18) |
| Rectum | 33 (35) | 16 (15) |
| Unknown | 4 (4) | 2 (2) |
| Age (years) | 68.9 [40–90] | 68.0 [45–87] |
| Paris classification | ||
| 0-Ip | 93 (100) | |
| 0-IIa | 40 (38) | |
| 0-IIc | 4 (4) | |
| LST-G | 21 (15) | |
| LST-F | 41 (39) |
All adenomas were classified endoscopically using the Paris classification; SSL; sessile serrated lesion, TSA; traditional serrated adenoma, LGD, low grade dysplasia; HGD, high grade dysplasia; proximal colon includes caecum, ascending and transverse colon; distal colon includes sigmoid, descending and splenic flexure.