absolute risk reduction versus relative risk reduction help!

[psheez42]

Can someone please explain the difference between absolute risk reduction verses relative risk reduction with examples and numbers....thanks

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[pinkyrx]

I found this explanation via a google search:

Absolute vs Relative Risk Reduction

Imagine a subject having 10% risk to die during the next 5 years as a result of complications of high blood pressure.

If his or her risk will decrease from 10% to 7% after after taking a hypertensive pill during several years, then

The absolute risk reduction will be 3% (10% - 7% = 3%),

The relative risk reduction will be 30% ((10% - 7%)/10% = 30%)

Here's another article with info:
http://nutrition.about.com/od/researchstudies/a/rrrvsarr.htm?p=1

 

[psheez42]

Thanks!!!!!!