Study sees lingering effects of 9/11

One in eight recovery and rescue workers who helped with the months-long cleanup at the World Trade Center showed signs of post-traumatic stress disorder three years after the Sept. 11, 2001, terrorist attacks, a study has found.

Workers with little or no experience with disasters showed the highest frequency of PTSD, said the study, published Wednesday in the American Journal of Psychiatry. The data come from the World Trade Center Health Registry’s survey of 28,000 workers in 2003 and 2004.

The survey found that 12.4% of workers probably had PTSD, an anxiety disorder caused by traumatic events such as war, terrorism or assault. Nationally, about 4% of the population has PTSD, the report said.

Most likely to show signs of the disorder were volunteers unaffiliated with a service organization (21.2%) and construction and engineering workers (17.8%), the report said. Volunteers with an organization, at 7.2%, were far less likely to show symptoms.

Many volunteers lacked training, said one of the report’s six authors, Dr. Lorna Thorpe, a New York City deputy commissioner of health. “This disorder was related to one’s occupation and also the tasks one engaged in,” she said. “Working at tasks one was not trained in was a major factor.”