 Additional studies have found significant differences in CDI scores of children who have experienced sexual abuse; and those who have attention deficit disorder; or learning disabilities, in comparison with controls.Children who were rejected by their peers, when compared with controls, had significantly higher CDI scores in one study, but not in another when compared with children who were considered "average".Children of individuals who are substance abusers also scored significantly higher on the CDI than children of non-substance abusers.