- A cohort study investigates which of thefollowing:
- Outcomes in an exposed and unexposed group
- Incidence of the disease at baseline
- Prevalence of the disease at baseline
- Exposures in a group with the disease and without thedisease
- Selection Bias is:
- When investigators are biased in the decision of who becomesthe principal investigator of the study
- When the quality of information present for the expose group isbetter compared to the non-exposed group
- When participant’s non-response or attrition is not due tochance
- When a researcher knows if a subject was exposed and decidesthat subject developed the disease, when the subject did not meetthe case definition.
- All of the following are examples of cohort studies,except:
- Researchers select 150 individuals with prostate cancer and 200individuals without prostate cancer to investigate the risk ofcycling and prostate cancer among men.
- Researchers review past medical records of 4,057 patients from2010-2005 to compare those who were on the 3rd floor of a hospitalto those not on the third floor to estimate the risk of developingMRSA.
- Investigators select 5,209 members of a community fromFramingham, MA to investigate factors, such as diet, exercise, andaspirin on the risk of cardiovascular disease in thefuture.
- Investigators select 1,000 healthy individuals free of asthmaat the beginning of the study to investigate the risk of asthma inthose who lived in a rural area (exposure) compared to an urbanarea.
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