Figure 2. Comparison of titration pressure (P_PSG) and autoCPAP P_MEAN, P_PEAKMEAN, and P₉₀ pressures.

Box and whisker plot of the titration (P_PSG) and 3 autoCPAP pressures. The box represents the 25th and 75th percentile with the median line. Whiskers extend approximately 1.5 times the interquartile range. The only pressure that was statistically significantly different from the other 3 pressures was P_MEAN (P < .0002). AutoCPAP, auto-titrated continuous positive airway pressure, P_MEAN = autoCPAP mean pressure, P_PEAKMEAN = autoCPAP peak mean pressure, P_PSG = optimal titration pressure, P₉₀ = average pressure ≤90% of the time.