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Group size, mean age and male percentage according to age study group
| Age study group | 40-49 yr | 50-59 yr | Total |
| Number of subjects | 505 | 1245 | 1750 |
| Mean age (yr) at colonoscopy (SD) | 45.30 (2.81) | 54.64 (2.83) | 51.94 (5.09) |
| Male percentage (%) | 55 | 51.2 | 52.3 |
