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A) Linear regression of the total number of pigmented neurons in one side of the substantia nigra versus age is significant (p = 0.0060) with R2 = 0.337; CV = 0.20. B) Linear regression of the mean volume of the pigmented neurons in the substantia nigra versus age (p = 0.046) withR2 = 0.18; CV = 0.31.
