The percentage of time within intended SpO2 was 584 % in the Auto-Mixer ( ) group and 33.74.7 % in the manual group , SpO2 > 95 % was 26.5 % vs 54.8 % , average SpO2 and FiO2 were 89.8 % vs 92.2 % and 37 % vs 44.1 % , and manual interventions were 0 vs 80 ( p < 0.05 ) .