FiO2	Fraction of inspired oxygen
PEEP	Positive end-expiratory pressure
PPV	Positive pressure ventilation
IQR	Interquartile range
SpO2@5	Preductal oxygen saturation at 5 min of life
rs	Spearman rank correlation coefficient. Positive rs values indicate direct correlations, whereas negative rs values indicate inverse correlations
nCPAP	Nasal continuous positive airway pressure
IVH	Intraventricular hemorrhage
MV	Mechanical ventilation
CPAP	Continuous positive airway pressure
HFNC	High-flow nasal cannula
RDS	Respiratory distress syndrome
OSI	Oxygen Saturation Index
NIRS	Near-infrared spectroscopy
OR	Odds ratio
RR	Relative risk
CI	Confidence interval
DuoPAP	Dual-level (bilevel) positive airway pressure