 Another study researched levels of depression and self-esteem in gifted children, and found that boys were significantly more depressed than girls, based on their CDI scores.Further, obese children scored as being more depressed on the CDI than their non-obese counterparts in one study.Children who have posttraumatic stress disorder (PTSD) and anxiety were more depressed, based on their CDI score results, than children who did not have PTSD or anxiety.