Figure 2. Pearson correlation and MSE of postrespiratory BP predictions.

Error plots for correlation of predicted mean SBP and DBP 10 seconds after respiratory events (A) and MSE of SBP and DBP signal reconstruction (B). The correlation was approximately 0.8 across both SBP and DBP for the respiratory events in the baseline study. Although diagnostic and titration datasets had different distributions, with less frequent respiratory events in the latter, the model predicted that BP continued to be highly correlated (r = .79 ± .04) to measured BP in the combined dataset. A low MSE of ∼3.79 mm Hg and ∼2.85 mm Hg was observed for SBP and DBP, respectively, using our M_BT model. M_T had the highest MSE, likely because of a lower number of respiratory events (there was a smaller sample for training and testing). BP = blood pressure, DBP = diastolic blood pressure, MSE = mean-squared error, SBP = systolic blood pressure.