Relationship between antral distension and postprandial symptoms in functional dyspepsia

Figure 4 Box-and-whiskers plots of gastric antral volume immediately (0), at 30 and at 60 min intervals, after the end of the ingestion of a standard meal in FD patients with (gray box) and without (white box) postprandial drowsiness. The boxes at each time unit extend from the 25^th percentile (x_[25]) to the 75th percentile (x_[75]) [i.e., the interquartile range (IQ)]; the lines inside the boxes represent the median values. The lines emerging from the boxes (i.e., the “whiskers”) extend to the upper and lower adjacent values. The upper adjacent value is defined as the largest data point≤ x_[75] + 1.5 × IQ, and the lower adjacent value is defined as the smallest data point ≥ x_[25] - 1.5 × IQ. Observed values more extreme than the adjacent values, if any, are individually plotted (circles).