08-CaseControl

08-CaseControl - 3/2/2011 Case-control studies 1 Study...

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Unformatted text preview: 3/2/2011 Case-control studies 1 Study designs: Case-control studies Victor J. Schoenbach, PhD home page Department of Epidemiology Gillings School of Global Public Health University of North Carolina at Chapel Hill www.unc.edu/epid600/ Principles of Epidemiology for Public Health (EPID600) 10/7/2008 Case-control studies 2 From my uncle Are you the weakest link? Below are four (4) questions. You have to answer them instantly. You can't take your time, answer all of them immediately. OK? Let's find out just how clever you really are. Ready? 10/7/2008 Case-control studies 3 Question 1 You are participating in a race. You overtake the second person. Question: What position are you in? 10/7/2008 Case-control studies 4 Question 1 – answer If you answer that you are first, then you are absolutely wrong! Answer: If you overtake the second person and you take his place, you are second! 10/7/2008 Case-control studies 5 On to question 2 Try not to screw up on the next question. To answer the second question, don't take as much time as you took for the first question. 10/7/2008 Case-control studies 6 Question 2 Question: If you overtake the last person, then you are …? 10/7/2008 Case-control studies 7 Question 2 – answer Answer: If you answered that you are second to last, then you are wrong again. Tell me, how can you overtake the LAST person?! …? You're not very good at this are you? 10/7/2008 Case-control studies 8 On to question 3 The third question is very tricky math! Note: This must be done in your head only. Do NOT use paper and pencil or a calculator. Try it. 10/7/2008 Case-control studies 9 Question 3 – what is the total? Take 1000 and add 40 to it. Now add another 1000. Now add 30. Add another 1000. Now add 20. Now add another 1000. Now add 10. 10/7/2008 Case-control studies 10 Question 3 – answer Did you get 5,000? The correct answer is actually 4,100. Don't believe it? Check with your calculator! 10/7/2008 Case-control studies 11 On to question 4 Today is definitely not your day. Maybe you will get the last question right? 10/7/2008 Case-control studies 12 Question 4 Mary's father has five daughters: 1. Nana, 2. Nene, 3. Nini, 4. Nono. Question: What is the name of the fifth daughter? 10/7/2008 Case-control studies 13 Question 4 – answer Answer: Nunu? NO! Of course not. Her name is Mary. Read again. (“Mary's father has five daughters.…”) You ARE the WEAKEST LINK!!!!!! Good- bye!!! (With Love, Your Uncle) 10/7/2008 Case-control studies 14 Plan for this lecture • Confidence intervals and significance tests (read only) • Incidence density and cumulative incidence (brief) • Attributable risk (brief) • Theoretical overview of case-control studies as a complement to the traditional perspective 10/7/2008 Case-control studies 15 Confidence intervals & significance tests • Everything you’ve been told so far about confidence intervals and statistical significance is probably misleading, including this statement....
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This note was uploaded on 02/13/2012 for the course EPID 600 taught by Professor Staff during the Spring '08 term at UNC.

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08-CaseControl - 3/2/2011 Case-control studies 1 Study...

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