To investigate serotonin’s role in suicidal behavior, the am…
To investigate serotonin’s role in suicidal behavior, the amounts of serotonin metabolites in the cerebral spinal fluid of 18 violent-suicide attempters are compared to the levels found in a group of 24 nonviolent-suicide attempters. The levels of serotonin metabolites are coded as low or normal/high, and the two groups are compared. These data would most appropriately be analyzed with a(n):