Behaviour profile of Hungarian adolescent outpatients with a dual diagnosis.

Dinya et al. (2012) asked 104 Hungarian teens with both intellectual disability and a second mental-health diagnosis to complete the Behavior Problems Inventory.

Parents and clinicians filled out the same checklist. The team then sorted the teens by IQ level to see if lower scores meant more behavior issues.

The lower the teen's IQ, the higher the BPI scores for self-injury and stereotypy.

Kids with the most severe cognitive delays showed the most frequent head-banging, hand-biting, and rocking.

Meuret et al. (2001) first showed that 10-15 % of all people with intellectual disability show aggression or self-injury. Elek narrows that lens to Hungarian teens with dual diagnosis and adds the IQ link.

Wilde et al. (2017) later used the same BPI in adults with tuberous sclerosis plus ID. They found similar rates of self-injury (31 %), proving the tool works across ages and syndromes.

Golubović et al. (2013) surveyed Hungarian teens with ID about quality of life. They used parent reports, just like Elek, but looked at happiness instead of behavior. Together, the two papers give a fuller picture of the same population.

If you assess teens with dual diagnosis, run the BPI and note the IQ band. A sharp jump in self-injury or stereotypy below an IQ of 40 is a red flag for intensive support.