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Why should medical students be interested in EPIDEMIOLOGY? Very basic concepts

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What is EPIDEMIOLOGY? Epidemiology is the study of the distribution and determinants of health-related states or events in specified populations, and the application of this study to control of health problems. Last ed. Dictionary of Epidemiology

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But can you imagine what is epidemiology like in clinical practiceby reading definition? Let's see some examples First, I will show you observational data of mortality.

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Mortality in Area A and Area B Area AArea B dead/populatio n 500/10,0001000/10,000 mortality5%10%

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If you categorize the populations by age and compare mortality of Area A with that of Area B area Aarea B age<60 dead/popu lation 500/10,00 0 250/5,000 mortality5% 60=

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The factors should be taken into consideration when you look at the data. age sex race year of birth.

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Answer CDCCDC revised classification system for HIV (AIDS) infection in 1993

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Next example subjects: smokers: 1000 non smokers: 1000 of same age range, sex ratio status of lung cancer for 5 years were observed.

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Results in 5 years smokersnon smokers lung cancer/ 1,000 50/1,00010/1,000 morbidity5%1%

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If the sample size of both group is not 1,000, but 100. smokers not smokers lung cancer/ total5/1001/100 morbidity5%1%

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Next example lung cancerhealthy alcohol intake yes/ no 71/2952/48 yes/no ratio2.451.08 p=0.006 by Chi-square testChi-square test

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Non-smokers lung cancerhealthy alcohol intake yes/ no 8/2216/44 yes/no ratio0.36 p=1.0 by Chi-square testChi-square test

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Smokers lung cancerhealthy alcohol intake yes/ no 63/736/4 yes/no ratio99 p=1.0 by Chi-square testChi-square test

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Why should medical students be interested in EPIDEMIOLOGY?

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Welcome to the world of Epidemiology

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