Considering the source of the data, does that source appear to be biased in some way?

Refer to the data in the table below. The entries are white blood cell counts (1000 cells ,?L) and red blood cell counts (million cells ,?L) from male subjects examined as part of a large health study conducted by the National Center for Health Statistics. The data are matched, so that the first subject has a white blood cell count of 8.7 and a red blood cell count of 4.91, and so on.

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Subject 2 3 4 5 8.7 5.9 6.2 5.9 White 7.3 4.44 5.59 Red 4.91 4.80 5.17 2.