Case fatality rate (casefatality rate）Definition of: It refers to the proportion of the number of people or animals who died from a certain disease in the total number of patients or animals in a certain period of time.A certain period of time can be one year for a disease with a long course, and months and days for a disease with a short course.[1]
Case fatality rate=a periodinternal causeA diseasedeath tollOr number of animals/number of people or animals suffering from a disease in the same period × 100%[1]
Case fatality rate andmortalityThe main difference before is that the case fatality rate is used to describe the severity of a specific disease, while the mortality rate refers to the frequency of dying of a certain disease at a certain time.[1]
Case fatality rate=number of deaths due to a certain disease in a certain period/number of patients suffering from a certain disease in the same period × 100%.
Mortality=total number of deaths in a certain period (due to a certain disease)/the same periodAverage population×100%。
It can be seen from the above formula thatdenominatorDifferent.The denominator of mortality isPossibleTotal population of deaths (often usedAnnual average population）Or total number of animals;The denominator of case fatality rate is the number of people or animals suffering from a disease in the same period.The former includes normal people or normal animals, while the latter only refers to patients with certain diseases.If the onset and course of a disease arestable stateThe case fatality rate and mortality rate have the following relationship:
Case fatality rate=mortality of a disease/morbidity of a disease × 100%[1]
significance
Announce
edit
1. The case fatality rate indicates thatProbability of deathTherefore, it can reflect the severity of the disease.
2. The case fatality rate can reflect the medical level such as diagnosis and treatment ability.
In the statistics of case fatality rate, we should also pay attention to,Confirmed caseThe denominator of the case fatality rate is the cases that can be confirmed in the statistics, and there may be some mild cases that are not included in the statistics;There may also be regional differences in the case fatality rate, which may be related to the morbidity andMedical resourcesThese two factors are related, and with the flow of medical resources to the "hardest hit areas", the case fatality rate in these areas may decline.In addition, there are differences in age and other aspects in the statistics of case fatality rate.[2-3]
