Page 34 - Post-traumatic stress disorder in adults with mild intellectual disability: Screening, assessment, and brief intensive EMDR therapy

Chapter 2
Abstract
Objective: To assess the reliability and construct validity of the Diagnostic
Interview Trauma and Stressors- Intellectual Disability – Adult version
(DITS-ID-adults) in adults with mild intellectual disabilities or borderline
intellectual functioning (MID-BIF).
Method: The DITS-ID-adults, Brief Symptom Inventory–18 (BSI–18), and
Impact of Event Scale-Intellectual Disability (IES – ID) were administered to
97 participants with MID-BIF who lived in supported housing. The Anxiety,
Depression, and Mood Scale (ADESS) and Behavior Problems Inventory
(BPI) were administered to their relatives.
Results: The interrater reliability of the DITS-ID-adults was good to
excellent. The construct validity of the DITS-ID-adults was good, based
on positive correlations between the BSI–18, IES-ID, ADESS and DITS-ID-
adults, and mainly positive correlations between the BPI and DITS-ID-adults
(r = .21 to r = .75). Reporting potentially traumatic events listed under the A
criterium for PTSD was associated with fulfilling PTSD symptom criteria.
In this sample, 58% were classified with post-traumatic stress disorder
(PTSD) according to the DITS-ID-adults, while PTSD diagnosis on file was
low (7%).
Conclusion: The present findings support the DITS-ID-adults as a reliable
and valid basis for classifying PTSD in individuals with MID-BIF.
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