Table 3.

Optimal interval for screening methods [2, 3, 9, 32, 36, 39].

Screening method	Interval	Reduction in mortality rate
FOBT	Every year	32%
FIT	Every year	Unknown
FIT-DNA	Every 3 years	Unknown
Colonoscopy	10 years	68%
Sigmoidoscopy	5 years	27%
Sigmoidoscopy plus FIT	Every 10 years plus FIT every year	38%