Change of blood pressure among hypertensive patients. Changes in systolic and diastolic blood pressure between the visit where treatment was started (usually the second visit) and the last follow-up visit. Dots are displaying mean values, bars the 95% confidence interval. Groups are according to the WHO grade of hypertension at initiation of therapy. Grade 1 n = 82; grade 2 n = 160; grade 3 n = 196). All changes are significant (p < 0.001).