Fig. 3

Kaplan–Meier survival curves according to six-unit risk score computed on stepwise Cox regression analyses generating groups. The four groups based on risk score—no risk (score 0, blue), low risk (score 1–2, green), moderate risk (score 3–4, orange), and high risk (score 5–6, red)—have considered left ventricular ejection fraction (A, LVEF) and end-diastolic volume (B, LVEDV), respectively