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P/F ratio comparison between prolonged (P) and repeated (R) prone positioning. Prone P/F ratio prior to turning supine compared to baseline, p < 0.001; P/F for repeated prone compared to baseline, p < 0.004; P/F 7 h after return to supine for single prone, p < 0.019 compared to baseline; P/F 8 h after return to supine from multiple prone turns, p < 0.18.
