Figure 2: Median concentration of adiponectin in peripheral blood of OSA patients and healthy subjects. Plots are the 10th, 25th, 75th, and 90th percentiles as vertical boxes with error bars. 1: all OSA patients; 2: healthy subjects; 3: OSA patients with BMI < 25; 4: obese OSA patients; 5: no obese OSA patients; 6: OSA patients with metabolic syndrome; 7: OSA patients without metabolic syndrome. There was significant difference between groups 3 and 4, 6, and 7 in Kruskal-Wallis test ().