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Survival curves comparing patients with different left ventricular ejection fraction (LVEF). Overall, there was a significant difference in survival among these 4 LVEF groups (p = 0.008). Cox regression only detected statistically significant HR between severe LVEF impairment and normal LVEF with HR of 12.5 (p = 0.021). HR = hazard ratio. LVEF = left ventricular ejection fraction.
