T1w	T1-weighted
MR	Magnetic Resonance
BAG	Brain Age Gap
HC	Healthy Controls
SA	Sleep Apnea
Dia	Diabetes
MS	Multiple Sclerosis
PD	Parkinson’s Disease
MCI	Mild Cognitive Impairment
AD	Alzheimer’s Dementia
MNI	Montreal Neurological Institute
KLD	Kullback–Leibler Divergence
SGD	Stochastic Gradient Descent
BASE	Brain Age Standardized Evaluation
MAE	Mean Absolute Error
LMEMs	Linear Mixed-Effects Models
ANOVA	Analysis of Variance
EMM	Estimated Marginal Means