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Found substantial support for DSM-III's criteria for Post-Traumatic Stress using 405 Vietnam combat veterans. The results also suggested that some additional symptoms such as depression and anger be included as major signs, especially when one is dealing with Vietnam veterans. A comparison of symptom intensity was made between Vietnam veterans and non-Vietnam veterans. The results of the second study showed that Vietnam veterans attested to experiencing significantly greater intensities of DSM-III criteria behaviors than did non-Vietnam veterans. However, no significant differences were found for symptoms related to depression.
Silver et al. (Sun,) studied this question.