Scale

A relative scale is used in all map animations, with 19 colours, ranging from blue and green shadings depicting low rates, to red and violet depicting high rates. A step change from one colour level to another corresponds to a 10% or 1.1-fold relative change in the incidence rate. The lower limit of the highest category is therefore always 5.07 times (1.1¹⁷) the upper limit of the lowest category. The colour scale is fixed, irrespective of the degree of geographical variability for a given cancer site.