Table 1.

Acronym definitions

AC	Anterior commissure
AD	Alzheimer’s disease
ADNI	Alzheimer’s Disease Neuroimaging Initiative
APC	Annual percent change
CC	Corpus callosum
CCi	Area of CC sub-regions i (i=1,2,3,4,5)
CCA	Total cross-sectional area of the CC
CCP	CC circumference
CDRSB	Clinical dementia rating sum of boxes
CIR	CC circularity: 4π×CCA/CCP2
df	Degrees of freedom
dfn	Numerator df
dfd	Denominator df
FLDR	Fisher’s linear discriminant ratio
HC	Healthy controls
MCI	Mild cognitive impairment
MCI-C	MCI converters
MCI-NC	MCI non-converters
MMSE	Mini-Mental State Exam
MRI	Magnetic resonance imaging
MSP	Mid-sagittal plane
PC	Posterior commissure
rCCA	APC of CCA (% per yr)
rCCi	APC of CCi (% per yr)
rCIR	APC of CIR (% per yr)
SE	Standard error