AUC	Area under the curve
BMI	Body mass index
CHD-PAH	Pulmonary arterial hypertension associated with congenital heart disease
CI	Confidence interval
CKD	Chronic kidney disease
CKD-EPI	Chronic Kidney Disease Epidemiology Collaboration
COPD	Chronic obstructive pulmonary disease
CTD-PAH	Pulmonary arterial hypertension associated with connective tissue disease
CTEPH	Chronic thromboembolic pulmonary hypertension
DVT	Deep vein thrombosis
eGFR	Estimated glomerular filtration rate
ELOS	Extended length of hospital stay
ESC/ERS	European Society of Cardiology/European Respiratory Society
GDPR	General Data Protection Regulation
IQR	Interquartile range
IPAH	Idiopathic pulmonary arterial hypertension
LOS	Length of hospital stay
NLR	Neutrophil-to-lymphocyte ratio
NT-proBNP	N-terminal pro-brain natriuretic peptide
NTAR	NT-proBNP-to-albumin ratio
OR	Odds ratio
PAH	Pulmonary arterial hypertension
PH	Pulmonary hypertension
PoPH	Pulmonary arterial hypertension associated with portal hypertension
RDW	Red cell distribution width
REVEAL	Registry to Evaluate Early and Long-term Pulmonary Arterial Hypertension Disease Management
RGR	Red cell distribution width-to-estimated glomerular filtration rate ratio
ROC	Receiver operating characteristic
SD	Standard deviation
T2DM	Type 2 diabetes mellitus
WHO-FC	World Health Organization functional classification
WBC	White blood cell