Assignment 1 - PHC 6020 Homework Assignment 1 Due 1:55pm...

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Due 1:55pm Tuesday September 13, 2011 (Please show all your work, i.e. the steps that are necessary to reach your results.) 1. (30 pts) Suppose in a population 30% of all individuals live in areas which are considered heavily air polluted. Among those living in heavily polluted areas 2% will develop chronic bronchitis in the next 5 years as compared to 1% among those living in the less polluted areas. a. What is the relative risk and odds ratio of developing chronic bronchitis among those in heavily polluted areas versus those in less polluted areas? b. In a prospective study, 1000 individuals are sampled among those living in heavily polluted areas and 2000 individuals are sampled among those living in less polluted areas. These 3000 individuals are all free of chronic bronchitis at the time of enrollment to the study and will be followed for 5 years to determine if they develop chronic bronchitis. Compute the expected counts a, b, c, d and marginal totals of individuals with/without chronic bronchitis in the following two-by-two table. Chronic Bronchitis Live in yes no Total Heavily polluted a b 1000 Less polluted c d 2000 Total 3000 c. In a case-control study, 1000 cases (individuals who develop chronic bronchitis over a 5 year period) and 2000 controls (individuals free of chronic bronchitis over the same 5 year period) are identified. For these individuals it is ascertained whether or not they lived in heavily polluted areas. For such a study, what would be the expected counts a, b, c, d and marginal totals of individuals living in heavily/less polluted areas in the following two-by-two table? Chronic Bronchitis
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This note was uploaded on 01/15/2012 for the course PHC 6020 taught by Professor Staff during the Fall '11 term at University of Florida.

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Assignment 1 - PHC 6020 Homework Assignment 1 Due 1:55pm...

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