Senior Member
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Join Date: Apr 2009
Location: Stafford, UK
Posts: 1,059
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Senior Member
Join Date: Apr 2009
Location: Stafford, UK
Posts: 1,059
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Indirect causes
Even if there is a correlation between occupation and PD, the cause may not be directly linked to the job. Instead, there may be a third factor linking the two. For instance, if the occupations listed as having high rates of PD had low rates of smoking, and if low rates of smoking led to high rates of PD.
John
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