Table 1. Definitions of classes of raised blood pressure.

Category	SBP (mmHg)		DBP (mmHg)
Optimal	< 120		< 80
Normal	120–129		80–84
High normal	130–139	or	85–89
Grade 1 hypertension (mild)	140–159	or	90–99
Grade 2 hypertension (moderate)	160–179	or	100–109
Grade 3 hypertension (severe)	≥ 180	or	≥ 110
Isolated systolic hypertension	≥ 140	and	< 90

SBP, systolic blood pressure; DBP, diastolic blood pressure