Figure 2

Box plots of hospital length of stay (LOS), according to category of red blood cell transfusion. RBC: red blood cell. The boxes indicate the first quartile, the median, and the third quartile. Open circles indicate minor outliers (observation 1.5 × interquartile range [IQR] outside the central box); asterisks indicate major outliers (observation 3.0 × IQR outside the central box).