I believe the question is, "Do you consider yourself a disadvantaged applicant?"
Economically means if you've had financial hardships in your life.
Medically disadvantaged means if you've had limited access to healthcare because you live in an underserved area or have been medically uninsured/underinsured. Or, something similar.
It does not mean, "Do you have any medical problems that have been obstacles along the way?" In fact, on your secondary applications you have to confirm that you are physically capable of performing the duties of a physician.
Hope this helps.