Fig. 1.

Box plots (a and b) show preoperative and postoperative PRL levels in the serum for patients with micro- (n = 24) and macroprolactinomas (n = 10). The lower and upper bars in the box plots delineate the lowest and highest measured PRL level for both groups, respectively. The box contains all PRL levels from the 25th to 75th percentile. The median PRL level is shown as a line in the box. The P-values for the preoperative (a) and postoperative PRL levels (b) between the two groups were *P = 0.0004 and P = 0.88, respectively