***p<0.001, **p<0.01, *p<0.05, + p<0.2
Gestational Age (GA), Intravenous antibiotics (IVABx), parental nutrition (PN), Patent Ductus Arteriosus (PDA), High Frequency Oscillation ventilation (HFOV), Mean Airway Pressure (MAP), fraction of inspired oxygen (FiO2), oxygen saturations(SpO2), partial pressure of carbon dioxide on blood gas (pCO2),Haemoglobin (Hb), Pulmonary interstitial emphysema (PIE), chest xray (CXR)