Proportion

Epidemiology is the underlying and basic science of public health. It could be defined as any research of health events in populations, including: how many are affected by such events, is the risk increasing or decreasing, what is the relevance of the problem and how could it be prevented.

Stratified and personalised medicine involves tailoring treatments towards a specific group of patients or to individuals.

The term 'personalised medicine' includes both stratification and personalisation, which are often incorrectly used as synonyms. However, the two are different, as explained further below.