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Anosmia [absence of the sense of smell] was defined as concentration levels zero to three, severe hyposmia [reduced sensibility to odors] as levels four to five, moderate hyposmia as levels six to eight, mild hyposmia as levels nine to 10 and normosmia [a normal sense of smell] as levels 11 to 12, the authors note.
The idea that human beings could only distinguish between 10,000 smells has been around since a 1927 study that posited four elementary odors that people are able to distinguish on a nine-point scale. Do the math and you get 6,651 discernible olfactory sensations, a number that was later rounded up to 10,000.