Research has attempted to subtype youth with<unk><unk><unk>  by distinguishing between those with childhood-onset versus adolescent-onset conduct disorder, conduct disorder co-morbid with attention deficit hyperactivity disorder (ADHD), or by the severity and type of aggression displayed. Children with CU<unk>  have more severe conduct disorder, and respond to different management. The Inventory of<unk><unk><unk>  (ICU) assesses three independent factors in CU<unk> : uncaring,<unk> , and<unk> . The severity of CD has been studied in children rated high on CU<unk> .
Callous and unemotional traits
Psychological resistance
Sense of impending doom
Ideas and delusions of reference
Emotional lability
Musical anhedonia
Anti-mask sentiment
Global perceptions of autism