Use the occurrence frequency index. Incidence rate is the frequency of a disease occurring in a certain population in a certain period (year, season, month, etc.). ), reflecting the incidence level of a disease in a certain population in a certain period, is a measure of the impact of the disease on the health of the population, and describes the distribution of the disease.

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:

The difference between morbidity and morbidity

The molecule of prevalence rate is the number of new and old cases of a certain disease in a certain population at a certain time. Whether it is a new disease or an old disease, as long as the disease does not heal within a certain period of time, it is recorded as the number of cases. The molecule of incidence rate is the number of new cases in the exposed population in a certain period of time. Who has new diseases in the exposed population is called "new cases"? .

Prevalence rate is the frequency of diseases obtained through cross-sectional survey, which is usually used to reflect the prevalence rate of chronic diseases with a long course of disease and its impact on people's health. Incidence is the frequency of diseases obtained from incidence reports or cohort studies, which is usually used to reflect the emergence of new cases.

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