If a person has an injury or mechanical reason for nerve damage at the thigh level, it will report as such.

I seem to recall a few posters posting here over the years
that their thigh report was lower than the ankle.

Also there are some primate studies showing that damage at
the dorsal roots along the spine, eventually show as loss of sensory fibers at the end points that those roots serve.

So it is possible that the thigh may test out lower under some circumstances. Everyone has slightly different nerve distributions too. For example, in acupuncture a nerve path listed on a diagram may be displaced slightly. Some sites blame this anatomical variation for acupuncture injuries.

Another example is MP(meralgia paresthetica). Some doctors blame an ischemic event (like a local blood clot) causing damage to the lateral femoral nerve. End stage MP becomes numb, so if a same is taken at that level of the lateral thigh, it may show fewer fibers correspondingly.

There is quite a bit of variance between people, of medical/biological issues. So nothing can be 100% the same.