Observational studies suggested a step-function decrease in cardiovascular risk with blood pressure below 120/80 mmHg, then a small increase for normal BP, and a large increase for high-normal or early-stage hypertension.

“showed that it appeared that the risk of of bad outcomes mostly coronary cardiovascular disease was lower step function lower in P patient had optimal blood press this is but you know according to the old classification people who blood pressure is 120 over 80 or less optimal and then a small step increase in people who had what was then classified normal and then a large step increase in people who were considered high normal or even early stage hypertension”