Ratio
Exercise:
Consider following data for a village.
Total population -2500
Population of infants-70
And numbers of still births (10) + live (80) in one year.
Total births are 90
Infant deaths -10 (neonatal =2, post-neonatal=8)
Under five deaths-14
Maternal deaths -2
Total deaths in one year-25
Contd.
Exercise
Calculate the following rates /ratios based on the data given above and compare with national data.
1. Still birth ratio
2. Still birth rate
3. Perinatal mortality
4. Neonatal mortality rate
5. Infant mortality rate
6. Under five mortality rate
7. Maternal mortality rate
8. Maternal mortality ratio
9. Crude death rate
10. Post neonatal mortality rate
Case Fatality Rate: Case fatality rate represents the killing power of a disease. It is simply the ratio of deaths to cases. The time interval is not specified. Case fatality rate is typically used in acute infectious diseases (e.g. food poisoning, cholera, and measles). Its usefulness for chronic diseases is limited because the period from onset to death is long and variable. The case fatality rate for the same disease may vary in different epidemics because of changes in the agent, host and environmental factors. Case fatality is closely related to virulence.
Total No of deaths due to a particular disease
Case fatality rate=------------------------------------------------------ X 100
Total no of cases due to the same disease
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