Fig.3 The relationship between the frequency of PP group and the improvement of patient’s oxygenation index. (A) Improvement of oxygenation in different times of PP; (B) The oxygenation index from PP1 to PP3; (C) Change amplitude of oxygenation index from PP1 to PP3 with three times or more PP patients (N=34); (D) Arterial blood gas indicators monitoring during PP1.
PP:Prone position;PP1,PP2,PP3:The 1st, 2nd, and 3rd time of PP;T0:0-6 hours before the current PP;T1:Starting from PP for 0-6 hours;T2:Starting from PP for 6-12 hours; T3:0-6 hours after the end of the PP. P values: *p < 0.05; **p < 0.01;***p < 0.001;****p < 0.0001.