Table 2.

Predictive value of positive test of fecal occult blood test according to colonoscopy or double-contrast barium enema results.

(%)	polyp	suspicious cancerous lesion*	cancer
Total	21.4	42.6	1.3
Gender
Male	18.2	50.7	1.6
Female	24.8	33.8	1.0
Age group
50–59	23.4	38.2	0.8
60–69	20.3	44.9	1.5
over 70	18.4	49.0	2.2

*Suspicious cancer lesions were categorized in the database based on individual physicians’ descriptions to express wide spectrum between definitive polyp and definitive cancer, possibly including inflammatory or high-grade dysplastic lesions that required further biopsy procedure.