Table 3.
Descriptive and Quantitative Data for Case Finding Studies
| Number of Patients with Proximal Neoplasia/Total Number for Each Group (%) | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| First Author, Year of Study | Mean Age, Y (Range) | Study Design | Definition of Distal Colon | Size of Distal Polyp Studied | Distal Polyp Required for Colonoscopy | Total Number | Distal Hyperplastic Polyps | Distal Adenomas | No Distal Polyps |
| Ansher, 198955 | 59 (16 to 95) | Retrospective | Left colon | — | No | 845 | 9/29 (31) | — | 25/739 (3) |
| Ellis, 199356 | 65 (53 to 77) | Retrospective | Rectosigmoid | ≤5 mm | Yes | 430 | 70/211 (33) | 87/219 (40) | — |
| Olsen, 199851 | — | Retrospective | Reach of sigmoidoscope | — | Only DHPs studied | 139 | 57/139 (41) | — | — |
| Pennazio, 199354 | 64 | Prospective | Rectosigmoid | ≥5 mm for DHP | No | 216 | 9/27 (33) | 47/95 (50) | 10/88 (11) |
| Provenzale, 199052 | — | Prospective | Rectosigmoid as diagrammed in reports | — | No | 970 | 15/47 (32) | 139/274 (51) | 198/862 (23) |
| Rokkas, 199353 | 61 (29 to 86) | Prospective | Reach of 60-cm sigmoidoscope | ≤1 cm | Yes | 75 | 16/45 (36) | 9/30 (30) | — |
DHP, distal hyperplastic polyp.