Question

# The following are data from a cohort study of the risk of stroke among male smokers...

The following are data from a cohort study of the risk of stroke among male smokers and nonsmokers over the age of 65 years.

Stroke

Yes            No

Smoker           168          3,264    3,432

Non-smoker    102         4320    4,422

270          7,584   7,854

What is the relative risk for the association of smoking (versus no smoking) and stroke?

 A. (168 / 270) / (3,264 / 7,584) = 1.45 B. (168 / 3,264) / (102 / 4,320) = 2.17 C. (168 / 3,432) / (102 / 4,422) = 2.13 D. (168 / 3,432) / (270 / 7, 854) = 1.42 E. None of the above.

The following are data from a cohort study of the risk of stroke among male smokers and nonsmokers over the age of 65 years.

A ) . (168 / 270) / (3,264 / 7,584)

= 1.45

B ). (168 / 3,264) / (102 / 4,320)

= 2.17

C ). (168 / 3,432) / (102 / 4,422)

= 2.13

D ). (168 / 3,432) / (270 / 7, 854)

= 1.42

E ). None of the above

 Stroke Yes No Total Smoker 168 3,264 3,432 Non-smoker 102 4,320 4,422 Total 270 7,584 7,854

Risk in smoking = 168/3432

Risk in non smoking = 102/4422

Relative risk   = Risk in smoking/ Risk in non smoking

= (168 / 3,432) / (102 / 4,422)

= 2.13

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