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

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Presentation on theme: "Why should medical students be interested in EPIDEMIOLOGY? Very basic concepts."— Presentation transcript:

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

2 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

3 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.

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

5 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, /5,000 mortality5% 60=

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

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

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

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

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

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

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

16 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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20 Why should medical students be interested in EPIDEMIOLOGY?

21 Welcome to the world of Epidemiology


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