Fig. 2. Direction and magnitude of urinary cortisol level change in individual PTSD inpatients between the period of hospital admission and the midcourse period representing the peak of group and exposure treatment. The delta value was calculated as the midcourse value minus the admission value. Three subgroups (sg-A, sg-B, sg-C) are defined on the basis of dividing the distribution curve into terciles: sg-A = bottom tercile subgroup with greatest decreases; sg-B = middle tercile subgroup with the least amount of changes; sg-C = top tercile with greatest increases.
