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. Author manuscript; available in PMC: 2012 Mar 1.
Published in final edited form as: Am Heart J. 2011 Mar;161(3):567–573. doi: 10.1016/j.ahj.2010.12.009

Figure 2.

Figure 2

Restricted cubic spline analysis for Cox proportional hazards model, in patients with heart failure with severe left ventricular systolic dysfunction (LVSD), showing a relatively linear association of systolic blood pressure with all cause mortality in A. External Peer Review Program (EPRP) database and B. Digitalis Investigation Group (DIG) trial. Solid line represents the estimated logarithmic hazard ratio of all cause mortality with 95% pointwise confidence band represented by broken lines.