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Figure 4 Age-specific hazard ratios for specified differences in usual systolic (A) and diastolic (B) blood pressures. Impact on stroke, ischemic heart disease (IHD), and other vascular events. Data from 61 prospective observational studies of blood pressure and mortality in one million adults with no vascular disease at baseline. CI = confidence interval. Reproduced from the Prospective Studies Collaboration (34), with permission.