Table 2

 Colonoscopy findings according to the test results

Positive G-FOBTHb level (I-FOBT) (ng/ml)Positive G-FOBT or I-FOBT
20–5050–75>75
Hb, haemoglobin; G-FOBT, guaiac faecal occult blood test; I-FOBT, immunochemical faecal occult blood test.
No neoplasia1081672872350
Adenoma <10 mm30671521124
Advanced neoplasia53502090170
Adenoma ⩾10 mm or high grade dysplasia <10 mm39481774149
Invasive cancer14231621