25(OH)D	25-hydroxyvitamin D
ANCOVA	Analysis of Covariance
BMI	Body Mass Index
ECLIA	Electrochemiluminescence Immunoassay
eGFR	Estimated Glomerular Filtration Rate
GST	Gait Speed Test
HGS	Handgrip Strength Test
IQR	Interquartile Range
MMSE	Mini-Mental State Examination
SD	Standard Deviation
SPPB	Short Physical Performance Battery
TUG	Timed Up and Go Test
VDR	Vitamin D Receptor