Secretion of melatonin and 6-sulfatoxymelatonin urinary excretion in functional dyspepsia

Figure 2 Twenty-four-hour urinary excretion of 6-OHMS in healthy subjects (K, clear bar, n = 30) and in patients with epigastric pain syndrome (grey bar, n = 30) and postprandial distress syndrome (dark grey, n = 30). Box represents median with 25th and 75th percentiles (lower and upper quartiles, respectively). The ends of the error bars represent the smallest and largest measurements in the study groups. ^bP < 0.01. PDS: Postprandial distress syndrome; EPS: Epigastric pain syndrome.