The association between challenging behaviour and symptoms of post-traumatic stress disorder in people with intellectual disabilities: a Bayesian mediation analysis approach.
PTSD symptoms, not trauma history itself, push caregiver-reported challenging behavior in adults with ID.
01Research in Context
What this study did
The team asked: does trauma itself cause challenging behavior, or does PTSD play a bigger role?
They worked with adults who have intellectual disability. Caregivers rated each adult’s behavior. The adults also answered PTSD questions when they could.
Using a Bayesian model, they tested whether PTSD symptoms sit between trauma history and later challenging acts.
What they found
Caregiver ratings showed a clear path: trauma raised PTSD symptoms, and those symptoms then raised challenging behavior.
Self-report data from the adults showed no links at all. In plain words, caregivers saw the problem through a PTSD lens even when the person did not report distress.
How this fits with other research
Cook et al. (2021) scoured the field and found almost no trauma-informed work in ID services. Lotfizadeh et al. (2020) now gives one concrete starting point: screen for PTSD first.
Reeve et al. (2016) and Martorell et al. (2011) both show that any extra mental-health diagnosis hikes caregiver stress. The new twist here is that PTSD may be the single best target, not just any comorbidity.
O'Dwyer et al. (2018) saw behavior problems linked to psychiatric diagnosis and pill load. Lotfizadeh et al. (2020) agree behavior is tied to mental health, but they pinpoint PTSD symptoms as the active ingredient.
Why it matters
If you write a behavior plan for an adult with ID, add a PTSD screener first. Treating aggression or self-injury without easing trauma cues may leave the real driver untouched. Share the PTSD results with caregivers so they can see the behavior through a trauma lens rather than a defiant one.
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02At a glance
03Original abstract
BACKGROUND: A preponderance of behavioural symptoms is assumed to be the main difference in the manifestation of symptoms of post-traumatic stress disorder (PTSD) in people with intellectual disability (ID). However, no study so far has assessed the relationship between challenging behaviour (CB) and PTSD. The present study aims to explore this relationship by exploring whether CB is directly related to trauma exposure or whether this relationship is mediated through core symptoms of PTSD. METHODS: Trauma exposure and current symptoms of PTSD were assessed in 43 adults with mild to moderate ID. Parallel versions were administered to 43 caregivers, including the Aberrant Behaviour Checklist to measure CB. Bayesian mediation analyses were conducted using self-rated and informant-rated data. RESULTS: The self-report data showed no associations of CB with trauma exposure or PTSD symptoms. The association between informant-rated trauma exposure and irritability was mediated by severity and frequency of PTSD symptoms. The associations between informant-reported trauma exposure and the Aberrant Behaviour Checklist subscales hyperactivity and inappropriate speech were mediated by PTSD symptom severity. CONCLUSIONS: The relationship between trauma exposure and CB was mediated by PTSD symptoms. PTSD core symptoms should be considered as underlying causes of CB, highlighting the necessity to explore trauma biography and symptoms of PTSD. The improvement of self-report assessment in people with ID is an important task for future studies.
Journal of intellectual disability research : JIDR, 2020 · doi:10.1111/jir.12733