People, who were present within the premises of World Trade Center, at the time it was attacked in 2001, have developed more chances of asthma as the general population, a new investigation of public health registry data has found.

The data from the World Trade Center Health Registry, tracks health effects two to three years after the attack. It conclude that three percent of adult residents and workers who were there at the time of attack, soon subsequently have developed asthma, two times the rate of fresh diagnosed asthma in the general population for the same span.

Asthma was more common among those who did not leave the area on 9/11 or returned back within two days, nearly four percent — and less prevalent, almost two percent, in those who came back in December.

The study estimates that 3,800 to 12,600 adults at the disaster site developed asthma, and 35,000 to 70,000 people developed post-traumatic stress syndrome as well. Women, from minorities and poor people have grater rates of both physical and mental problems, the study says.

“The analysis provided high and low estimates to account for the possibility that people who were feeling sick or who had had more intense exposure to the disaster site might have been more motivated to sign up for the study.” said Linda Thorpe deputy commissioner of health department.

Researchers say that, the analysis provides the clear picture yet of the health of 71,437 adults, including rescue workers, area workers, passers-by and residents, who agreed to be tracked for up to 20 years after the attack.

They represent 17.4 percent of the 410,000 people having intense exposure to the massive disaster. City’s health department and the federal Centers for Disease Control and Prevention are conducting registry.

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