Table 1.

The effect of different screening schedules for CRC

	Time without cancer
Age of colonoscopy	>50 y, %	>60 y, %	>70 y, %	>75 y, %
No colonoscopy	4.70	4.10	3.00	1.80
Age 50, 55, 60	2.10	1.90	1.40	0.80
Age 55, 60, 65	1.80	1.50	1.00	0.50
Age 60, 65, 70	1.30	1.00	0.70	0.50
Age 50, 60, 65	1.90	1.80	1.10	0.60
Age 55, 65, 70	1.60	1.20	0.70	0.50
Age 50, 60, 70	1.30	1.10	0.60	0.30

Probability of getting CRC by age 80 if no CRC was detected by age x (>x years), according to different screening regimes. It is assumed that a colonoscopy removes all detectable polyps present in the colon of the patient.