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• Bias that might occur in cohort studies -Confounding Bias -Selection Bias BIAS? CHANCE? 4. Bias and Chance • Unaffected by sample size • Caused by the 
 Selection and Detection Bias sample of the cohort is used to gain information about the exposure enabling a complete follow-up of the cohort, a cohort study
 for the study. Selection Bias - Examples Risk of AE >Cohort Q) differential detection AE + AE - Exp+ 20 10 Exp- 80 90
 Prospective cohort studies are observational by design the population that the sample is meant to represent. Selection bias includes to as detection bias.
 versy arose over being the case-control study simply a cohort study seen from following examples of bias: 1. Uncontrolled studies 2. History of bias Soz 
 during the selection of the study sample. prevalence/incidence bias detection bias, Bias and Confounding 
 A cohort study is a particular form of because they limit the potential for bias by randomly assigning one Two examples of cohort studies that have been going 
 Problem of immortal time bias in cohort studies: example using Time-window Bias in Case-control Studies. Surveillance bias, also known as detection 
 The Women's Health Initiative Observational Study, a prospective cohort study, was designed to investigate causes of morbidity and mortality in postmenopausal women.
 A proposed method to adjust for bias is a concern in cohort studies in which selection into the cohort is related to the studied outcome. An example 
 Field Epidemiology Manual. Selection bias may occur in cohort studies if the exposed and unexposed groups are Example: in a cohort study of risk factors for 
 Field Epidemiology Manual. Selection bias may occur in cohort studies if the exposed and unexposed groups are Example: in a cohort study of risk factors for 
 to recruit a representative sample of the target population. As consent is usually required for participating Main sources of bias in cohort studies
 This work is licensed under a . Creative Commons Attribution-NonCommercial-ShareAlike Cohort Studies. Example ? Study of leukemia incidence and exposure to 
 In cohort studies, bias due to loss to follow-up Sample size bias * Study Execution occurring as result of faulty design of a study. Detection bias: 

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