Figure 2. Changes in the American Orthopaedic Foot and Ankle Society (AOFAS) Score in a Study of the Effect of Platelet-Rich Plasma (PRP) Injections vs Placebo on Ankle Symptoms and Function in Patients With Ankle Osteoarthritis.

See Table 1 footnotes for scale definitions. The mean difference between the PRP and the placebo group over 26 weeks was −1 (95% CI, −6 to 3). The boxes show the median and IQR, with the bottom and top indicating the 25th and 75th percentiles, respectively. The upper whisker extends from the top of the box to the largest value no further than 1.5 times the IQR. The bottom whiskers extend from the bottom of the boxes to the smallest value no further than 1.5 times the IQR. Dots indicate outliers outside the whisker range.