Calculation method:
Incidence rate = (the number of new cases of a certain disease in a certain period/the number of exposed people in the same period) ×K
K= 100%, 1000‰, 10000/ million or 100000/65438+ million, etc.
The observation time unit can be determined according to the characteristics of the diseases and research problems studied, usually expressed in years.
Extended data:
Incidence can be used to reflect the impact of diseases on people's health. A high incidence rate means that the disease has a great impact on health, and a low incidence rate means that the disease has a small impact on health. Incidence can be used to describe the distribution of diseases. By comparing the incidence of people with different characteristics, we can explore the causes of the disease and evaluate the prevention and control measures.
Because the incidence level is influenced by many factors, there may be differences in age, gender and other components when comparing different data, so the incidence rate should be standardized.
Baidu encyclopedia-incidence rate