Gordis Epidemiology
Gordis Epidemiology
6th Edition
ISBN: 9780323552295
Author: David D. Celentano, Moyses Szklo
Publisher: ELSEVIER
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Chapter 12, Problem 1RQ
Summary Introduction

To calculate: The relative risk for thyroid tumors.

Introduction: The relative risk is the ratio between risk in exposed to the risk in unexposed. It also defined as “the probability of an event ocuuring in exposed people compared with the probabilty of the event in unexposed people”.

Expert Solution & Answer
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Explanation of Solution

As per the given data the following table can be constructed:

Radiation therapyBenign thyroid tumorNo tumorTotalincidence
Received52 (a)2820 (b)2872 (a+b)a/(a+b)
Unrecived6 (c)5049 (d)5055 (c+d)c/(c+d)

The relative risk is calculated as follows:

Relative=aa+bcc+d=5252+282066+5049=52287265055=15.3

Therefore, the relative risk for thyroid tumors is 15.3.

Conclusion

As per the given data, the relative risk for thyroid tumors is 15.3.

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