Frequency measures are widely used in epidemiology to characterize the occurrence of an event in a population. Ratios, proportions, and rates are examples of frequency measures; ratios and proportions are valuable tools for defining population characteristics. Morbidity and mortality are measured using proportions and rates. These measurements assist epidemiologists in predicting risk across various groups, identifying high-risk groups, and establishing hypotheses.
Incidence and prevalence are the two most important indicators of morbidity. Various mortality rates are used to characterize deaths in specific populations by age, sex, or cause. Source: CDC
