The prevalence of challenging behaviors: a total population study.
Roughly a large share of people with ID in services show aggression or self-injury, with rates jumping higher in specific genetic conditions like tuberous sclerosis.
01Research in Context
What this study did
Researchers counted every person with intellectual disability who used services in one English region.
They asked carers to report any hitting, biting, head-banging, or other tough behaviors.
The team wanted to know how common these behaviors are across the whole population.
What they found
About 1 in 7 people showed challenging behavior.
Aggression and self-injury were the most common problems.
Boys and young adults had the highest rates.
Half of the most severe cases still lived at home with family.
How this fits with other research
Wilde et al. (2017) looked deeper at adults with tuberous sclerosis plus ID.
They found even higher rates: a large share self-injury and a large share aggression.
This extends the 2001 finding by showing specific genetic conditions push numbers higher.
Dinya et al. (2012) surveyed Hungarian teens with dual diagnosis.
They used a behavior checklist and found scores rose as IQ dropped.
This matches the 2001 pattern that younger age and lower ability increase risk.
Together these studies build a clear picture: prevalence sits around 10-a large share overall, but climbs when you narrow to certain ages, diagnoses, or lower cognitive levels.
Why it matters
If you serve 100 clients with ID, expect about 15 to show aggression or self-injury.
Screen boys and young adults first.
Ask families where the client lives; half of severe cases are still at home and may lack full-time support.
Use this number when you plan staffing, caregiver training, and crisis-response resources.
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02At a glance
03Original abstract
A total population study was undertaken in two areas of England to identify the situation and characteristics of people reported to exhibit challenging behaviors. We found that: (1) challenging behaviors are shown by 10-15% of people with mental retardation who are in contact with educational, health or social care services for people with mental retardation; (2) the most common forms of challenging behaviors reported were 'other' behavior (shown by 9%-12% of all people screened), aggression (7%), destructive behavior (4%-5%) and self-injury (4%); (3) the majority of people identified showed two or more of these four general forms of challenging behavior; (4) approximately two-thirds of the people identified were boys/men; (5) close to two-thirds of the people identified were adolescents or young adults; (6) approximately 50% of the people identified as showing more demanding challenging behavior were living with their families; (7) people who showed more demanding challenging behavior were more likely to need greater levels of assistance in eating, dressing and washing, be incontinent and have more restricted expressive and receptive communication.
Research in developmental disabilities, 2001 · doi:10.1016/s0891-4222(00)00061-5