Block 1: Epidemiology
EPI3-7: FOUR MEASURES OF EFFECT: THE ODDS RATIO

Consider the table below:

  Exposed Not exposed  
Diseased a c a + c = n1
Not diseased b d b + d = n0
  a + b = m1 c + d = m0 T

The odds ratio is defined as:

Example:

From the table above the




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General Introduction to Occupational Health: Occupational Hygiene, Epidemiology & Biostatistics by Prof Jonny Myers is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 2.5 South Africa License
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