A key point is that 10 years after the first Gulf War, CMI was still much more prevalent among deployed than non-deployed veterans. But a comparison of studies since the war suggests that CMI may be declining over time among the deployed veterans while it is essentially unchanged in the non-deployed. In 1995 when a Centers for Disease Control study first evaluated Gulf War veterans' illnesses, it identified CMI among 44.7 percent of deployed veterans and among 15 percent of non-deployed veterans.
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