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Prevalence of advanced polyps by location n (%)
| Period I 1998-2001 | Period II 2002-2005 | Total | |
| (n = 237) | (n = 376) | (n = 613) | |
| Location | |||
| Right | 46 (19.4) | 91 (24.2) | 137 (22.3) |
| Left | 115 (48.5) | 130 (34.6) | 245 (40.0) |
| Both | 76 (32.1) | 155 (41.2) | 231 (37.7) |
