"The prevalence of borderline hypertension was calculated by determining the number of persons who had systolic pressures between 140 and 160 mm Hg or who had diastolic pressures between 90 and 95 mm Hg."
This is more inline with what I've been thought in med school in my time.
I found https://www.epicentro.iss.it/ben/2002/settembre02/2_en (the same health institute that provided the study I was talking about above). I quote:
"The prevalence of borderline hypertension was calculated by determining the number of persons who had systolic pressures between 140 and 160 mm Hg or who had diastolic pressures between 90 and 95 mm Hg."
This is more inline with what I've been thought in med school in my time.