Question

An outbreak of gastritis occurred on a cruise ship. The data in the following Table were obtained, shortly after the outbreak, from a questionnaire completed by everyone on board the ship. Food People Who Ate Food People Who Did Not Eat Sick Well Sick Well Herring 200 800 100 900 Chicken 650 350 100 900 Spinach Souffle 200 800 500 500 Oysters 300 700 400 600 Chocolate Mousse 600 400 450 550 1. Calculate the attack rates for each food and show your work (hint, you will need to add some data columns to this table!) 2. What is the relative risk of developing gastritis for herring consumption? Show calculation. 0.5 2.0 2.3 8.0

          An outbreak of gastritis occurred on a cruise
ship.  The data in the following Table were obtained,
shortly after the outbreak, from a questionnaire completed by
everyone on board the ship.
Food
People Who Ate Food
People Who Did Not Eat
Sick
Well
Sick
Well
Herring
200
800
100
900
Chicken
650
350
100
900
Spinach Souffle
200
800
500
500
Oysters
300
700
400
600
Chocolate Mousse
600
400
450
550
1. Calculate the attack rates for each food and show your work
(hint, you will need to add some data columns to this table!)
2. What is the relative risk of developing gastritis for
herring consumption? Show calculation. 
0.5
2.0
2.3
8.0

Added by Carolina M.

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