Incidence refers to the number of new myeloma cases arising in a given period in a specified population. This information is collected routinely by cancer registries in many countries. Here it is expressed as an absolute number of myeloma cases per year. This data is from 2022.

The crude incidence rate is the number of new myeloma cases in a specified population per year. Here incidence is presented as an annual rate per 100,000 of the population. This data is from 2022.

The age standardised rate (ASR) is a weighted mean of the age-specific rates where the weights are taken from the population distribution of a standard population; the ASR is expressed per 100,000. Comparison of rates referring to different time periods or different geographical areas is only possible after considering the differences in the age structure of the underlying populations. The age-standardisation allows the comparison of the rates that are arithmetically adjusted to have the same age structure of the standard population. The standard population used in the ECIS are the following old European Standard Population, new European Standard Population, and World Standard Population.