Fish diet Medical researchers followed 6272 Swedish men for 30 years to see if there was any association between the amount of fish in their diet and prostate cancer. ("Fatty Fish Consumption and Risk of Prostate Cancer," Lancet, June 2001)a) Is this a survey, a retrospective study, a prospective study, or an experiment? Explain.
b) Is this a test of homogeneity or independence?
c) Do you see evidence of an association between the amount of fish in a man’s diet and his risk of developing prostate cancer?
d) Does this study prove that eating fish does not prevent prostate cancer? Explain

Respuesta :

Although epidemiological research on fish consumption are rare, eating fatty fish may lower the incidence of prostate cancer. We looked at a population-based prospective cohort of 6272 Swedish males to examine the relationship between fish consumption and prostate cancer. Men who consumed no fish had a two- to three-fold higher prevalence of prostate cancer throughout the 30-year follow-up period than men who consumed moderate or high levels. Our findings imply that eating fish may lower the risk of developing prostate cancer.

Two categorical variables are observed for each observational unit in the test of independence, which involves randomly selecting observational units from a population. Data from each sub-group are individually sampled at random for the homogeneity test. (For example, 100 each of blacks, whites, American Indians, and so forth.)

There is NO relationship between fish consumption and Prostate Cancer.

Prostate cancer and fish consumption have both been examined in various contexts. Prostate cancer rates are lower among populations with high fish consumption than in populations with Western diets, where fish intake is often lower, such as populations in Japan and Alaskan Eskimos (3–5).

Our studies found a significant 63% decrease in prostate cancer-specific mortality but no conclusive evidence of a protective relationship between fish diet and prostate cancer incidence.

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