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The results obtained from studies of causation 

The results obtained from studies of causation
Chapter:
The results obtained from studies of causation
Author(s):

Mark Elwood

DOI:
10.1093/med/9780199682898.003.0004
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date: 18 September 2019

This chapter shows the format and derivation of results from studies. Cohort and intervention studies yield relative risk and risk difference, also known as attributable risk, and number needed to treat (NNT). Count and person-time methods are shown. Additive and multiplicative models for two or more exposures are shown. Case-control studies give primarily odds ratio; the relationship between this and relative risk is explained. Different sampling schemes for case-control studies include methods were a case can also be a control. Surveys yield results similar to cohort studies.

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