Figure 2: Graph (box plots) shows mean ADCs of the malignant and benign lesions. The horizontal line is a median(50th percentile) of the measured ADC values, the top and bottom of the box represent 25th and 75th percentiles, respectively, and whiskers indicate the range from the largest to smallest observed data points within 1.5 interquartile range presented by the box. Note that ADCs of early stage NPC and lymphoma are significantly lower than those of benign nasopharyngeal diseases (P<0.01, Independent Samples T text).