PUB210 Questions On Concepts Of Epidemiology - Assessment Task 2

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Question 3

A health department was notified of an outbreak of gastroenteritis among guests who had attended a party. Everyone who attended the party was interviewed by the outbreak investigation team, which included an epidemiologist. They were asked about the foods they had consumed at the party and whether or not they had become ill. The following information was obtained:

A total of 300 guests attended the party and all were interviewed. Of these 200 had developed gastroenteritis in the 24-hour period following the party.

The number of people who ate each of the three main foods at the party is shown below.

Ate Sick Not sick
Chicken 140 90
Salad 190 85
Coleslaw 160 30

 

a. What is the absolute risk (or probability) that a person developed gastroenteritis after eating? (1 mark)

  1. Chicken
  2. Salad
  3. Coleslaw

b. Construct a 2X2 table for exposure to coleslaw and the outcome of gastroenteritis for the 300 people who attended the party (2 marks)
c. What is the relative risk of illness among those who ate coleslaw compared with those who did not? (1 mark)
d. Write a conclusion about the association between consuming coleslaw and developing gastroenteritis among the group of party attendees (2 marks)

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