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.
Other causes of retinopathy of prematurity (ROP) can include: exposure to pure oxygen or toxins following birth inadequate levels of oxygen during pregnancy slow or delayed fetal development in the uterus; Medical Mistakes that Cause Retinopathy of Prematurity (ROP) Tragically, healthcare professionals can make mistakes that cause or worsen a baby's case of retinopathy of prematurity. 1  Possible malpractice contributing to retinopathy of prematurity (ROP) may include (but aren't limited to): 2  exposing newborns to toxins. 3  failing to provide necessary eye exams to high risk infants. more information...