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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.
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©2013 UpToDate ® Print Email Joint effect of systolic and diastolic blood pressure on mortality Among participants in the NHANES II who were ≥65 years of age, the figure shows a three dimensional surface representing the relative risk for cardiovascular mortality (vertical axis) with different combinations of the diastolic blood pressure (right diagonal arrow axis) and the systolic blood pressure (left diagonal arrow axis). For a fixed diastolic blood pressure, for example, the effect of different systolic blood pressures can be evaluated by following the risk surface along lines parallel to the systolic blood pressure axis. This effect is known as the conditional effect of systolic blood pressure. Similarly, for a fixed systolic blood pressure, the conditional effect of diastolic blood pressure can be evaluated by following the risk surface along lines parallel to the diastolic blood pressure axis. Redrawn from: Pastor-Barriuso R, et al. Ann Intern Med 2003; 139:731.