hi, expert,   In a paper named "MRI of hippocampal volume loss in early Alzheimer's disease", I can see the average volume of hippocampus is 2133mm^3 for 279 normal controls with std=25 as well as 1631mm^3 for 330 AD subjects with std=34. However, in the aseg.stats, the volume of a normal subject is roughly 4000mm^3 or so, why the hippocampus volume of two samples differ so greatly due to age effect ( nearly about two times as much as the volume of the study).   Thanks!

 
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