Answer Happy

A cohort study investigates the association between occupational exposure to a specific chemical and mortality. Those occupational exposed to the specific chemical are treated as the exposed group in the cohort study, and the general population is used as an unexposed comparison group. Suppose that the general population has a 20% higher risk of mortality than the employed workforce (the true comparison population). Compare the true relative risk and the estimate of the true relative risk obtained from the study below. True Effect Exposed Worker True Comparison Population Control Estimate of True Effect (Study Data) Exposed Worker General Population Control Death 140 toward the null; overestimate toward the null; underestimate away from the null; overestimate away from the null; underestimate 100 Death 140 120 No Death 860 900 Due to the bias you identified above, the estimate of the true relative risk obtained from the study is biased __.The estimate of the true relative risk obtained from the study is an of the true relative risk. No Death 860 880