Figure 1. Comparison of preoperative and postoperative apnea hypopnea index (AHI).

Significant improvements in the AHI were observed following surgery. (A) Dot plots representing individual patient AHI result before and after surgery. Data presented for each surgeon and for both surgeons together (combined). (B) Box plot representing median, interquartile range, minimum, and maximum of AHI measurements for the combined data set, with patients tonsil size and palate (relative to tongue) position categorized according to Friedman (FRG) stage. *p < 0.05 related-samples Wilcoxon signed ranks test. N = 21 Surgeon 1, N = 27 Surgeon 2, N = 48 combined. N = 17, 23, 7, 1 for FRG class 1, 2, 3, 4, respectively.