Figure 4. Bland-Altman plots of comparison of the titration pressure and 3 autoCPAP pressures.

Bland-Altman plots of titration pressure (P_PSG) compared with 3 autoCPAP pressures. (A) P_PSG compared with P_MEAN. (B) P_PSG compared with P_PEAKMEAN. (C) P_PSG compared with P_90. Means of P_PEAKMEAN and P₉₀ were similar to the titration pressure. P_MEAN was smaller than the titration pressure. Each dot shows the average of 2 pressures on the x-axis vs difference of 2 pressures on the y-axis for a single participant. AutoCPAP, auto-titrated continuous positive airway pressure, interrupted horizontal lines = ±1.96 times the standard deviation of the differences between pressures, solid horizontal line = mean of the differences.