Fig. 2.

Kaplan–Meier overall 3-year survival for cardiovascular (CV) mortality (a) and 3-year survival for CV mortality in subgroups according to serum albumin quartiles (b–e). Overall survival for CV death was worse in patients with Mg values below the median value (< 2.4 mg/dl, n = 136) than in patients with Mg values greater than the median value (≥ 2.4 mg/dl, n = 217). The hazard ratio (95% confidence interval) for CV death was 3.73 (2.07–6.98), P < 0.0001 (a). However, the significant difference for CV mortality was lost in subgroup analyses when serum albumin quartiles were incorporated (b–e). Mg, serum magnesium; No., numbers; CI, confidence interval