α	Alpha
ABP	Arterial blood pressure
ADF	Augmented Dickey–Fuller
AIC	Akaike information criterion
ARIMA	Autoregressive integrative moving average
ASD	Absolute signal difference
CA	Cerebral autoregulation
CBF	Cerebral blood flow
CBv	Cerebral blood volume
COx	Cerebral oximetry index with CPP
COx-a	Cerebral oximetry index with ABP
COx-a_Invos	COx-a obtained with rSO2 from the INVOS NIRS system
COx-a_Oxymon	COx-a obtained with rSO2 from the OxyMon NIRS system
CPP	Cerebral perfusion pressure
CVR	Cerebrovascular reactivity
d-order	Moving average order
fNIRS	Functional near-infrared spectroscopy
HbDiff	Difference between oxyhemoglobin and deoxyhemoglobin
HbO	Oxyhemoglobin
HHb	Deoxyhemoglobin
HVA	Healthy volunteers
ICP	Intracranial pressure
IQR	Interquartile range
IRF	Impulse response function
KPSS	Kwiatkowski–Phillips–Schmidt–Shin
LoA	Limit of agreement
MAIN-HUB	Multi-Omic Analytics and Integrative Neuroinformatics in the HUman Brain
MAD	Median absolute deviation
NA	Represents missing value or undetermined value due to inadequate data
NIRS	Near-infrared spectroscopy
p-order	Autoregressive order
q-order	Moving average order
r	Pearson correlation coefficient
relative bias	Bias as a proportion of LoA spread
rSO2	Regional cerebral oxygen saturation
rSO2_Invos	Frontal right rSO2 signal obtained using the INVOS NIRS system
rSO2_Oxymon	Frontal right rSO2 signal obtained using the OxyMon NIRS system
tHb	Total hemoglobin
VARIMA	Vector ARIMA