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Figure 1 Cumulative incidence of hypertension in subjects with high-normal blood pressure as a function of three categories of systolic blood pressure change during ergometric exercise at baseline. Three categories are upper (high, n = 60), middle two (moderate, n = 120) and lower quartiles (low, n = 59). The subjects in the high category showed significantly higher incidence of hypertension compared with those in moderate and low categories over six years of follow-up.