In a box and whisker plot: the ends of the box are the upper and lower quartiles, so the box spans the interquartile range; the median is marked by a vertical line inside the box; the whiskers are the two lines outside the box that extend to the highest and lowest observations. Example 1 â Box and whisker plots Summary A box and whisker plot (sometimes called a boxplot) is a graph that presents information from a five-number summary. It does not show a distribution in as much detail as a stem and leaf plot or histogram does, but is especially useful for indicating whether a distribution is skewed and whether there are potential unusual observations in the data set.
Causes and Risk Factors for Henoch-Schonlein Purpura. The exact cause of HSP is not known. The body's immune system is believed to play a role in targeting the blood vessels involved. An abnormal immune response to an infection may be a factor in many cases.
Causes of Low Phosphorus Levels. Causes of hypophosphatemia can occur based on several conditions including alcoholism, chronic diarrhea, malnutrition, burns or uncontrolled diabetes. Chronic hypophosphatemia occurs when your kidneys are unable to reabsorb phosphorous due to chronic conditions or long-term use of medications such as diuretics.