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Unformatted text preview: Follow up through time. Case control studies—starting with outcome (i.e. obesity), then find similar people who are not obese, then go back in time to see some similarities in the past Ecological Studies—ecological fallacy. We can take population data, and apply to individual. Japanese people eat fish, low coronary heart disease. We cannot say, individuals should eat fish to reduce coronary heart disease Cross sectional study—exposure and outcome. Frequently surveys. 24 hr dietary recall • Interview • Not representative • Expensive 72 hr food diary • Person could lie • Inaccurate • Less prone to error than the FFQ • Better to remember FFQ • More prone to error Bias • Interviewer bias-interviewee might not tell the truth because of the interviewer • Selection bias-• Information/misclassification: when someone is put in the wrong group • Confounding • Ecological Fallocy...
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- Spring '10
- Ethics , person, Quantifiable data Experimental