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To study a presumed inverse relationship between black tea consumption and cardiovascular disease, investigators randomly selected...

To study a presumed inverse relationship between black tea consumption and cardiovascular disease, investigators randomly selected a sample of 13,500 subjects, 50-64 years of age, and queried them about tea consumption and current treatment for cardiovascular disease. No significant association was found between drinking black tea and having cardiovascular disease.

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Not a relative risk. Observational study helps to demonstrate the relationship between the groups and variables. There are no factors to find an association between them. There is no association between the consumption of black tea and cardiovascular disease. It is not a relative risk to study the relationship between the cause and the effect.

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