Abstract
Suppose we are studying whether there is a link between exposure to a toxic chemical and the development of lung cancer in a chemical industry. To answer this question properly, we would want to isolate the effect of the chemical from the possible influence of other variables, particularly age and smoking status, two known risk factors for lung cancer. That is, our goal is to determine whether or not exposure to the chemical contributes anything over and above the effects of age and smoking to the development of lung cancer.
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© 2013 Springer Science+Business Media New York
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Kleinbaum, D.G., Sullivan, K.M., Barker, N.D. (2013). Control of Extraneous Factors. In: ActivEpi Companion Textbook. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5428-1_13
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DOI: https://doi.org/10.1007/978-1-4614-5428-1_13
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Publisher Name: Springer, New York, NY
Print ISBN: 978-1-4614-5427-4
Online ISBN: 978-1-4614-5428-1
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