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# Epidemiology lecture 4 death rates

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Epidemiology
Measuring Disease Frequency-Death Rates

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### Epidemiology lecture 4 death rates

1. 1. EPIDEMIOLOGY Lecture 4 Death Rates
2. 2. Learning Objectives 1. Understand specific and proportional death rates 2. Understand the need for standardization 3. Describe the TWO methods of standardization 4. Calculate age-standardized death rates.
3. 3. Crude death rate Number of deaths during the year Mid-year population X 1000
4. 4. What is the disadvantage of a crude death rate? Population A Age group Population No. of deaths 0-15 300 3 15-60 200 1 >60 500 5 Total 1000 9 Age group Population No. of deaths 0-15 100 1 15-60 800 4 >60 100 1 Total 1000 6 Population B
5. 5. Specific Death Rates • Cause or disease specific • Age-specific • Sex-specific • Age and sex-specific • Related to specific groups (Remember incidence rates for smokers, ex-smokers, never-smokers????)
6. 6. Age-specific death rate Total number of deaths in a specified age group in a defined area during a specified period Mid-year population of the specified age group X 1000
7. 7. EXERCISE 1 • Calculate age-specific death rate for the age group 20- 30 years and compare it with the crude death rate. Age group Population Number of deaths 0-10 200 4 10-20 300 3 20-30 300 2 30-40 350 3 40-50 400 5 50-60 250 7 60-70 150 5 70-80 50 7 Total 2000 36 6.67 18
8. 8. Sex-specific death rate Total number of deaths in males (or females) in a defined area during a specified period Mid-year population of males (or females) X 1000
9. 9. EXERCISE 2 • In the year 2013, the mid-year population of a town was 100,000. Calculate the specific death rate for males in the town for the year 2013, given that: – Number of male deaths in 2013=500 – Sex ratio=1000 males per 1000 females. 10
10. 10. Disease-specific death rate Total number of deaths due to a disease (e.g., Cancers) in a defined area during a specified period Mid-year population X 1000
11. 11. EXERCISE 3 • The mid-year population during 2013 was 50000. The number of deaths during this year was 600 out of which 50 died due to cancer. Calculate: – The crude death rate. – Specific death rate due to cancer. 12 1
12. 12. Proportional Mortality • The number of deaths from a given cause per 100 or 1000 total deaths in the same period. • Relative importance of specific disease or disease group, as a cause of death.
13. 13. EXERCISE 4 Number of deaths for Leading Causes of Death – United States, 2003
14. 14. EXERCISE 5
15. 15. EXERCISE 5
16. 16. EXERCISE 5
17. 17. EXERCISE 5
18. 18. EXERCISE 5
19. 19. EXERCISE 6
20. 20. EXERCISE 6
21. 21. EXERCISE 6