Oxygen Saturations in the blood will be comparedBy assessing the difference in average gradient of the PaO2:FiO2 (PF ratio) in the prone and control groups over the trial period (72 hours). Calculate by pulse oximetry recordings and oxygen delivery method as recorded in the medical chart; calculated by methods describe in the literature; utilising the equation log(P:F Ratio) = 0.48+0.78log(S:F Ratio).[During study period (Study Days 1-3 inclusive) in the intervention group]

Oxygen Saturations in the blood will be comparedBy assessing the difference in average gradient of the PaO2:FiO2 (PF ratio) in the prone and control groups over the trial period (72 hours). Calculate by pulse oximetry recordings and oxygen delivery method as recorded in the medical chart; calculated by methods describe in the literature; utilising the equation log(P:F Ratio) = 0.48+0.78log(S:F Ratio).[During study period (Study Days 1-3 inclusive) in the intervention group]