black15 - Epidemiology Epidemiology is pretty crappy at...

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Epidemiology Epidemiology is pretty crappy at dealing with cause and effect when associations are subtle
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Types of Epidemilogy Studies Descriptive studies are simply those that describe the events and rates of disease. They tend to be the first sets of studies done. Quoted or paraphrased from http://dante.med.utoronto.ca/doch/Year1/EPIModule/Part6a.htm Observational studies then look towards finding out the causes of the observed rates. They are called "observational" since the epidemiologist does not intervene in the assignment of exposure. Experimental studies are formal research experiments. The classic example is the randomized control trial where one group is randomly assigned a treatment and a control group gets the placebo or "usual" treatment. Experimental studies are expensive and test a very specific question. Usually a great deal of descriptive and observational studies are done first.
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Determination of Etiology
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Some Definitions from Epidemiology Incidence New cases per some interval time Prevalence # of cases per some interval time Endemic Consistently non-zero prevalence Epidemic (increasing) incidence Pandemic World-wide incidence Sporadic Prevalence sometimes 0 but not predictably so Propagated epidemic incidence propagated by individual-to-individual transmission Common-source outbreak incidence propagated by something other than infected individuals
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Epidemic
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This note was uploaded on 06/03/2011 for the course MCB 205 taught by Professor Abedon during the Spring '11 term at Ohio State.

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black15 - Epidemiology Epidemiology is pretty crappy at...

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