Box-and-whisker plots of mean elasticity, maximum elasticity, and elasticity ratio of malignant and benign masses. The top and bottom of each box were the 75th and 25th percentiles, respectively; the horizontal line in each box was the median; and the top and bottom of the whiskers were the minimum and maximum, respectively. The mean elasticity, maximum elasticity, and elasticity ratio were significantly higher for malignant than benign masses (all P<0.001).