Fig. 5

Effects of calendar year and age on the number of patients presenting with colorectal cancer. Effects of calendar year and age on the number of patients presenting with colorectal cancer in a Poisson regression with fractional polynomials (confidence intervals are shaded grey, logarithmic scale on the y-axis, males in the figures to the left). The increase for each calendar year diminished in the later years. The effect of age was linear in both males and females