It's important to take elevated blood pressure seriously, but it is only part of the cardiovascular risk bigger picture, (lipid's/smoking/weight/exercise etc).
The chart is useful Tableview, and contains some useful stuff around lifestyle. Pilot's will love it, the figure looks like something out of a PPL training manual.
I'm not sure if it's that useful to place "classifications" on levels. (Although
NICE do.) And how useful is a "snapshot" figure? Average home reading's or ambulatory reading's are probably more useful.
The stuff around low blood pressure is confusing to say the least.
Celery anyone...pass the salt.