>Doctors make up 1/3 of a percent of the US population >1.68% of Americans have a Phd If you mean medical doctors you should specify that, Doctors has a diffe

>Doctors make up 1/3 of a percent of the US population >1.68% of Americans have a Phd If you mean medical doctors you should specify that, Doctors has a different meaning especially within the context of post graduate degree holders.