WEEK 5 PROBLEMS-1.docx - HLTH 501 WEEK 5 PROBLEMS30 POINTS...

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HLTH 501 W EEK 5 P ROBLEMS —30 POINTS 10 points per problem. Place answer in the following table: 1. A. 3.306 B. 4.394 2. A. 438.505 B. 501.41 C. 425.835 3. A. 2.49 B. 1.85 1. A study is run to estimate the association between exposure to lead paint in childhood and attention-deficit hyperactivity disorder (ADHD). Data on n = 400 children are collected and data on exposure and ADHD diagnosis are shown below. Exposure to Lead Paint ADHD No ADHD Yes 34 71 No 29 266 A. Estimate the crude or unadjusted relative risk. 34/105-0.324 29/295=0.098 0.324/0.098=3.306 R R ˆ ___3.306_____ B. Estimate the crude or unadjusted odds ratio. P1/(1-P1)=0.324/(1-0.324)=0.479 P2/(1-P2)= 0.098/(1-0.098)=0.109 0.479/0.109=4.39 R O ˆ __4.39_____ 2. A study is conducted in patients with HIV. The primary outcome is CD4 cell count which is a measure of the stage of the disease. Lower CD4 counts are associated with more advanced disease. The investigators are interested in the association between vitamin and mineral Page 1 of 3
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HLTH 501 supplements and CD4 count. A multiple regression analysis is performed relating CD4 count to use of supplements (coded as 1=yes, 0=no) and to duration of HIV, in years (i.e., the number of
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