Figure 1. Graph showing the mean values of corticotrophin (ACTH) in patients with chronic fatigue syndrome (n = 15) and healthy control subjects (n = 10). (A) The whole 24-hour period, with each point representing the mean of values and standard errors over a 2-hour period. (B) The values at each 15-minute sampling point during the overnight (10 pm to 10 am) period.