**GCH 300 Introduction to Public Health**

**Epidemiologic Calculation Practice Exercise**

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**Name: _______________________________________________ Date:__________________**

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**Directions: Read each exercise carefully. Think about the information being provided. Circle your final answer. Complete in pencil. Show all work.**

**Exercise A**

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On a separate sheet of paper provide all answers to Activity 2″ on page 101 of your textbook (Activity 2 is on page 94 in the 7^{th} Edition).

**Exercise B**

There are 346 students (184 females, 162 males) at Hillside School. During March and April, 56 students (17 females, 39 males) were absent with chickenpox. The 56 students who were absent had 88 brothers and sisters at home. Of the 88 siblings, 19 developed chickenpox. Of the 75 total cases of chickenpox, one child died. Calculate the following:

- The attack rate for chickenpox at Hillside School

- The attack rate (secondary) among the siblings

- The case fatality rate for chickenpox in this epidemic

- The “relative risk” for chickenpox among males compared to females

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**Exercise C**

In an epidemic in Sample City (population 100,000: 60,000 males and 40,000 females), there were 600 cases (350 males, 250 females) of Weilerpox. There were 70 deaths (all males) due to this disease and 880 deaths due to other causes. Calculate the following:

- Crude death rate.

- Cause-specific mortality rate

3 Case-fatality rate

- Cause-specific morbidity rate for females

- Case fatality rate for males

- The proportionate mortality ratio

**Exercise D**

Last July 4, Percy Foote hosted a family reunion at his family farm in Middleburg Virginia. The total family guest list was 167, including 106 females and 61 males. That evening three family members (2 females and 1 male) were killed in a motor-vehicle accident while driving home. Three days later, 66 family members (27 females and 39 males) were diagnosed with salmonellosis. Of the 66 cases of salmonellosis, 8 died (3 females and 5 males). Answer the following:

- What type of illness is salmonellosis?

- What was the attack rate for salmonella at the Foote Family Reunion?

- What was the attack rate among the female population?

- What was the attack rate among the male population?

- What was the case-fatality rate for the salmonellosis outbreak?

- What was the “relative risk” for salmonella among males compared to females?

- What was the proportionate mortality ratio for salmonella among the family members attending the reunion?

**GCH 300 Introduction to Public Health**

**Epidemiologic Calculation Practice Exercise**

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**Answer Sheet**

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**Name: _______________________________________________ Date:__________________**

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**Exercise A**

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What conclusion can you draw about the risk for acquiring TB for populations in each age group?

Which age group exhibit the highest disease rates?

Explain why it is important to calculate rates to report disease outbreaks accurately.

**Exercise B**

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**Exercise C**

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**Exercise D**

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