Kaplan-Meier survival curves for mortality according to serum potassium variability.

<p>(A) all-cause mortality; (B) cardiovascular mortality. Patients were split into four categories according quartiles (Q) of coefficient of variation of serum potassium (CVSP): Q1: <7.5%; Q2∶7.5 to <12.0%; Q3∶12.0 to <16.7%; Q4: ≥16.7%. The P values refer to the significance of the log-rank test across quartiles.