ACTH	Adrenocorticotropic Hormone
BMI	Body Mass Index
CI	Confidence Interval
CLIA	Chemiluminescent Immunoassay
ESPEN	European Society for Clinical Nutrition and Metabolism
FFM	Fat-Free Mass
HR	Hazard Ratio
ICC	Intraclass Correlation Coefficient
ICU	Intensive Care Unit
IGF-1	Insulin-like Growth Factor-1
IQR	Interquartile Range
LOS	Length of Stay
MAR	Missing At Random
MV	Mechanical Ventilation
REE	Resting Energy Expenditure
SD	Standard Deviation
SEM	Standard Error of the Mean
SOFA	Sequential Organ Failure Assessment