Table 1.
Summary of baseline characteristics.
| Characteristic | Mean (range) Unless otherwise noted |
Number of studies reported |
|---|---|---|
| Total number of patients evaluated | 22,936 (80 to 5175) | 40 |
| Randomized controlled trials, number of patients | 9304 (80 to 895) | 28 |
| Controlled clinical trials, number of patients | 740 (328 to 412) | 2 |
| Observational studies, number of patients | 12,892 (100 to 5175) | 10 |
| Age of subjects, years (range of means) | 57 (44 to 63) | 34 |
| Age of subjects, years (range of medians) | 55 to 65 | 3 |
| Gender, male, % | 46 (28 to 81) | 38 |
| Indication for colonoscopy screening, % | 61 (0a to 100) | 20 |
| Location—USA/Canada, number of patients | 12,208 (100 to 5175) | 17 |
| Location—Asia/Australia, number of patients | 8045 (80 to 3079) | 14 |
| Location—Europe, number of patients | 2683 (160 to 895) | 9 |
aTwo studies reported that screening was not an indication for colonoscopy. Chiu et al. [20] included participants who had colorectal neoplasms detected at a screening colonoscopy and were scheduled for a second colonoscopic examination for either elective polypectomy or endoscopic mucosectomy. Manno et al. [41] included participants with a positive fecal occult test or those in surveillance postpolypectomy.