Question

Someone has conducted a study to see if there is increased risk of getting lung cancer if you work in a coal mine. In group 1, 30 of the 150 coal miners got lung cancer. In group 2, 5 out of the 250 non- coal miners got lung cancer. What is the sample relative risk

Answer 1

The sample relative risk is 10.

What is relative risk?

Sample relative risk is the ratio of disease risk or death in an exposed group to the disease risk or death in an unexposed group. Sample relative risk is a descriptive statistic.

What is the sample relative risk?

Sample relative risk = fraction of coal miner who got lung cancer / fraction of non coal miners who got lung cancer

Sample relative risk = (30 / 150) ÷ (5/250)

(1/5) ÷ (1/50

1/5 x 50 = 10

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