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. Author manuscript; available in PMC: 2011 Feb 1.
Published in final edited form as: Neuroimage. 2009 Nov 12;49(3):2123–2133. doi: 10.1016/j.neuroimage.2009.11.006

Table 2.

Compilation of the variables, their meaning and origin in this study. Refer to the text for further explanation.

Variable Meaning Source Relation Unit/ factor levels
age Subject age XML Subject Years
gender Gender XML Subject m/f
weight Subject weight XML Subject kg
grp Clinical group XML Subject Normal/MCI/AD
dc Device/coil combination DICOM Device -
fs Field strength DICOM Device T
tr Repetition time DICOM Protocol ms
te Echo time DICOM Protocol ms
vs Voxel size DICOM Protocol mm3
snr Signal/noise ratio qc Protocol -
cnr Contrast/noise ratio qc Protocol -
mi Mutual information qc Protocol -
wgc WM/GM contrast ratio seg Study -
csfv CSF volume seg Study ml
icv intracranial volume seg Study ml
gmv GM volume seg Study ml
wmv WM volume seg Study ml
brv (GM + WM) volume seg Study ml
gwr gmv/wmv ratio seg Study -
brr brv/icv ratio seg Study -