Table 2.
Characteristics of the 978 patients with polyps n (%)
| Period A (1989-1993) 273 patients | Period B (2003-2007) 705 patients | P value | |
| Male | 178 (65.2) | 418 (59.3) | 0.0892 |
| Female | 95 (34.8) | 287 (40.7) | |
| Age (yr) | |||
| < 50 | 50 (19.2) | 91 (12.9) | < 0.0015 |
| 50-59 | 44 (16.9) | 154 (21.9) | |
| 60-69 | 103 (39.5) | 226 (32.1) | |
| 70-79 | 57 (21.8) | 185 (26.3) | |
| ≥ 80 | 7 (2.7) | 48 (6.8) | |
| Total No. of polyps | 428 | 1265 | |
| No. of polyps, mean ± SD | 1.6 ± 1 | 1.8 ± 1.3 | 0.0102 |
| No. of polyps, median | 1 | 1 | |
| Range | 1-6 | 1-14 | |
| Dimensions | |||
| < 5 mm | 114 (26.6) | 530 (41.9) | < 0.00005 |
| 5-9 mm | 228 (53.3) | 454 (35.9) | |
| 10-19 mm | 44 (10.3) | 191 (15.1) | |
| 20-29 mm | 23 (5.4) | 52 (4.1) | |
| 30-39 mm | 9 (2.1) | 25 (2) | |
| 40+ mm | 10 (2.3) | 13 (1) | |
| Histopathological pattern | |||
| Hyperplastic | 91 (33.6) | 438 (38.7) | < 0.00005 |
| Mild/moderate dispalsia1 | 151 (55.7) | 597 (52.7) | |
| Severe dysplasia2 | 27 (10) | 87 (7.7) | |
| Others3 | 2 (0.7) | 10 (0.9) | |
1
Tubular, mixed or villous adenoma with mild or low grade dysplasia;
2
Tubular, mixed or villous adenoma with severe dysplasia or cancer in situ or serrated adenoma;
3
Lymphatic lump, hamartoma, leiomyoma, anal human papilloma virus.