Figure 1

The detection rate (%) for colorectal cancer and advanced adenomas for the operative range of the immunochemical faecal occult blood test (iFOBT) (50–2000 ng ml−1). Overall detection rate of colorectal cancer and advanced adenomas (O), subgroup detection rates of colorectal cancer (C) and advanced adenomas (A) (adenomas ⩾10 mm, adenomas with high-grade dysplasia or adenomas with a villous component ⩾20%).