Block 1: Epidemiology
EPI3-7: FOUR MEASURES OF EFFECT: THE ODDS RATIO
Consider the table below:
Exposed
Not exposed
Diseased
a
c
a + c = n
1
Not diseased
b
d
b + d = n
0
a + b = m
1
c + d = m
0
T
The
odds ratio
is defined as:
Example:
From the table above the
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
.