Following the 1980 Mount St. Helens volcanic eruption, psychiatric
reactions were studied in the disaster area and in a control community.
Using the new criterion-based diagnostic method for psychiatric
epidemiologic research, the Diagnostic Interview Schedule, the authors
found a significant prevalence of disaster-related psychiatric disorders.
These Mount St. Helens disorders included depression, generalized anxiety,
and posttraumatic stress reaction. There was a progressive "dose-response"
relationship in the comparison of control, low-exposure, and high-exposure
groups. The dose-response pattern occurred among both the bereaved and the