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

Figure 1 Serum melatonin concentrations at 02:00 h and 09:00 h in healthy subjects (K, clear bar, n = 30) and epigastric pain syndrome (grey bar, n = 30) and postprandial distress syndrome (dark grey bar, 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 < 0.001. PDS: Postprandial distress syndrome; EPS: Epigastric pain syndrome.