A description of a melanoma’s thickness in millimetres, which is classified into four categories: less than 1 mm, 1–2 mm, 2.1–4 mm or greater than 4 mm.

…the national average for each thickness category. In contrast, most of the geographical areas in northern, central and western Australia tended to be below the national average diagnosis rate, and these geographical patterns were also largely consistent across all thickness…

What is known? Queensland has the highest incidence rate of melanoma in the world. The risk of a patient dying from their melanoma increases with increasing tumour thickness at diagnosis. What is new? In a population-based study of 44,531 people…