Fig. 1. Difference between oscillometric cuff and radial artery catheter measurements of blood pressure. Average difference (± SD) between simultaneous noninvasive (NIBP) and invasive radial artery (ABP) systolic (A ), diastolic (B ), and mean (C ) blood pressure measurements in 24,225 adult patients during noncardiac surgery and anesthesia, as well as total sample size of data pairs for each ABP value (bell-shaped curve and right-side Y-axis).