Need help with a homework for Principles of Epidemiology class.

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Need help with a homework for Principles of Epidemiology class.

Need help with a homework for Principles of Epidemiology class.
NAME: ___________________________________ Example of a cohort study The Table below is based on an outbreak of gastroenteritis following a church supper. Of the 80 persons attending the supper, 75 were interviewed. Forty-six met the case definition. Attack rates were calculated for those who did and did not eat each of the 14 food items. Number of persons who ate food item Number of persons who did not eat food item Ill Total Attack rate (%) Ill Total Attack rate (%) Baked ham 29 46 17 29 Spinach 26 43 20 32 Mashed potatoes 23 37 23 37 Cabbage salad 18 28 28 47 Jello 16 23 30 52 Rolls 21 37 25 38 Brown bread 18 27 28 48 Milk 44 71 Coffee 19 31 27 44 Water 13 24 33 51 Cakes 27 40 19 35 Vanilla Ice Cream 43 54 21 Choc. Ice Cream 25 47 20 27 Fruit salad 42 69 Figure out the Attack rates (%) for each food item by people who ate the food and people who did not eat the food. Do a 2 x 2 table for each food item and figure out the relative risk (RR) for each food item. For this assignment only include the 2 x 2 table of the item you think is most likely responsible for the outbreak. What is the food item you think most likely caused the outbreak and what is the RR for this food item? Example of a case-control study In the Table below, figure out the Odds Ratios for exposure to foods served in a hospital that had a salmonellosis outbreak. Sixty-five patients and staff member met the case definition. Their exposures to specified foods were compared to those of 62 healthy patients and staff members. From the Odds Rations you calculated for each food item, what food item most likely is the cause of the outbreak and what was the Odds Ratio for this item? Cases (n = 65) Controls (n = 62) Ate Did Not Eat Ate Did Not Eat Odds Ratio French onion soup 51 15 45 Baked ham 21 37 18 42 Parsley sauce 18 40 15 45 Cold salads 54 52 Creamed potatoes 23 35 23 35 Turnips and cabbage 30 29 21 38 Chicken curry rice 15 44 53 Sandwiches 53 56 Danish pastries 58 53 Chocolate mousse cake 42 16 53 Ice cream 10 48 16 43 Scones 58 56 2

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