The scatter graph with regression line (95% CI) of the changes in the PTI and MPP versus changes in the VAS score after MP placement. The correlations of the changes in VAS scores with changes in the MPP and PTI values were statistically significant (r = 0.77, R
2 = 0.59, p < 0.001; r = 0.60, R
2 = 0.36, p < 0.009). MPP, maximal peak pressure; PTI, pressure time integral; VAS, visual analog scale. CI, confidence interval.