Boston University surveyed 460 parents in the Boston area and found that 11-percent of kids who attended the Marathon in 2013 had nightmares, anxiety, and flashbacks of the event. Children ages 4 to 19 who saw what happened were six times more likely to develop PTSD symptoms than those who didn't attend.
The survey also found that children who watched three hours of television on April 15, 2013 displayed signs of PTSD.
Researchers say this report is similar to findings among New York children six months after the September 11 attacks.
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