Fig 5. Survival curve in relation to prognostic index (PI) at admission in patients of HBV-related acute-on-chronic liver failure with normal levels of serum Cr.

Dashed line represented the high-risk group (PI ≥ 3.91) and plain line represented the low-risk group (PI < 3.91). The survival rate in low risk group (PI < 3.91) was 94.3%, which was markedly higher than those in the high-risk group (PI ≥ 3.91) (17.4%, P < 0.001).