Fig. 2.
Boxplot showing the opioids used in patients with different severity of obstructive sleep apnea (OSA) or without OSA (A) and in patients with different types of anesthesia (B). The box represents the interquartile range (IQR); the line inside the box represents the median; the upper whisker is drawn from the upper edge of the box to the largest value within 1.5 × IQR; the lower whisker is drawn from the lower edge of box to the smallest value within 1.5 × IQR; colorful dot and triangles indicate the values outside 1.5 × IQR. Opioids presented as intravenously injected morphine-equivalent dose (mg). +Adjusted P < 0.05 versus opioid requirement in patients receiving general anesthesia. The numbers inside box are the group median.