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Figure 4 (A) Highest postoperative B-type natriuretic peptide (BNP) levels in patients that were alive and group that were deceased within one year. p = 0.007. (B) Highest postoperative BNP levels in patients that were hospitalized up to 10 days, and patients that had prolonged hospital stay ( 10 days) after open-heart surgery. p = 0.0001. The ends of the whiskers show the position of the minimum and maximum of the data, whereas the edges and line in center of the box show the upper and lower quartiles and the median. The whiskers show at a glance the behavior of the extreme outliers, whereas the box edges and midline summarize the sample in a resistant manner. Strong asymmetry in the box midline and edges suggests that the distribution is skewed and can be quantified using the Yule-Kendall skewness statistic.
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