Figure 2.

Restricted cubic spline curves for an association between systolic blood pressure and all-cause death (A), heart failure readmission (B), cardiovascular death (C), and all-cause hospitalization (D) in patients hospitalized for heart failure. Hazard ratios and 95% confidence intervals for clinical outcomes by systolic blood pressure groups in 4,564 patients hospitalized for heart failure according to restricted cubic spline regression models using four knots at systolic blood pressures of 95, 115, 129, and 157 mmHg. SBP of 130 mmHg was applied as the reference. Solid blue lines indicate hazard ratios, and shaded areas indicate 95% confidence intervals. CI, confidence interval; HR, hazard ratio; SBP, systolic blood pressure.