Call to action: Can you work out the PAR% of the following scenario?
The PAR% indicates that if the exposure were to be completely removed, by how much would the outcome be reduced as well in the community? You will note if either a 
The concept of PAR% indicate that while there can be a number of causes for an outcome, the fractions of these causes do not have to add up to 100%; they can be less than 100% or they can even add up to more than 100%. Below is an illustration of this situation. 
Consistency ...
Biological Gradient ....