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Boxplots of the influence of the HFRS on the length of stay in hospital. A white dot is indicating an outlier (3rd quartile + 1.5 interquartile range or 1st quartile − 1.5 interquartile range) and a * an extreme outlier (3rd quartile + 3 interquartile range or 1st quartile − 3 interquartile range).
