Researchers have found that rates of suicide among African-American children, specifically boys, have doubled since 1993, surpassing the rates among white children which dropped over the same period. The study, published in the journal JAMA Pediatrics Tuesday, was based on data obtained from the Centers for Disease Control and Prevention which gives a breakdown of causes of death in 657 cases of suicide among children ages five to 11 between 1993 and 2012, 84 percent of whom were boys.