I've been browsing around looking at 'normal' BP rates and see there are a lot of differences of opinion as to what is or isn't a healthy reading.
The NHS seem to stick rigidly to 120/80 whatever your age, where other sites bring age into their calculation. If I follow the NHS criteria I have high BP, but the other calculations make me more or less normal if I keep below 140/90.
How is the age and sex of a person's BP calculated - is there a formula?