The relationship between the frequency of critical values and the length of hospital stay.

<p>Note: (A) critical values of serum potassium. (B) critical values of platelet count. The patients were divided into 3 groups based on the frequency of the critical values: group A (1 time), group B (2–3 times), group C (≥4 times). Statistics: box plots showing the median, quartiles, and range. Kruskal-Wallis nonparametric test, <i>p</i>-values shown. Man-Whitney U tests (** p<0.0033).