Page 38 - Post-traumatic stress disorder in adults with mild intellectual disability: Screening, assessment, and brief intensive EMDR therapy

Chapter 2
(e.g., anxiolytics) were used as exclusion criteria. The study protocol and
detailed procedures were approved by the Central Committee Involving
Human Subjects of the Radboud University Medical Centre (reference
number: 2020–6967 – NL75909.091.20). After the study procedures had
been fully explained and after at least a week of consideration, 100 hundred
participants gave their written informed consent to participate in the study,
to record the interview on video, and to process the data anonymously. A
legal representative also signed up for clients who were not fully mentally
capable of providing consent to decide whether they wanted to participate
in the study or not.
Of the 100 participants who initially participated in this study, 97 completed
the interview with DITS-ID-adults. Only three participants (3%) terminated
the interview early; one participant did not understand the questions in
the event section, while two participants expressed that they felt sad at
the event section and, therefore, did not want to continue. Eventually, the
sample consisted of 97 adults (55 women and 42 men) with MID-BIF.
Their mean age was 32 years (range:18-73; SD = 14.07). IQ scores were
available for 92 participants; for 5 participants IQ score in their client file
were lacking, but their file specified that they had MID. The mean IQ was 68
(range:50-85; SD = 9.39); 52 participants had MID (54%), and 45 participants
had BIF (46%). Of the 97 participants, 37 (38%) had at least one additional
DSM-5 diagnosis in their medical record. Twenty participants (21%) were
diagnosed with autism spectrum disorder, four (4%) with mood disorder,
two (2%) with anxiety disorder, three (3%) with personality disorder, eleven
(11%) with attention deficit hyperactivity disorder (ADHD) and seven (7%)
participants had been diagnosed with PTSD prior to the study.
One-third (34%) indicated that they had received trauma treatment before.
To examine the association between reporting a PTSD criterion A event and
fulfilling the PTSD symptom criteria, only data from participants who had
not received trauma treatment (N = 64) were used. This is because trauma
treatment interferes with the association between reporting a Criterion A
event and PTSD symptoms, and one of the aims of trauma treatment is to
reduce PTSD symptoms. Data from all participants (N = 97) were used to
examine the construct validity and interrater reliability.
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