Page 64 - Post-traumatic stress disorder in adults with mild intellectual disability: Screening, assessment, and brief intensive EMDR therapy

Chapter 3
97 participants. For all three sections of the TS-ID adult version (i.e.
checklist on traumatic and stressful events, PTSD symptoms and impact
of the symptoms on daily life), participants first read the instructions
independently and were then asked, ‘Can you tell me what to do now?’.
If a participant could not read, all questions of the screener were read
out loudly. If the participant understood what he or she had to do, they
proceeded independently to complete the questions in the section. If the
participant did not understand what they should do, the instruction was
explained by the students or researcher after which they were asked again,
‘Can you tell me what to do now?’. If the participant still did not understand
what to do, the student or first author read the first three questions of
the section to the participant, after which the participant responded. If,
after the first three questions, the participant was still unable to continue
answering the questions independently, all questions in the section were
read aloud by the student or first author. Completing the TS-ID adult version
took approximately 10 minutes on average (M = 10.3; SD = 4.5). Help was
needed by 35 participants in the first part of the TS-ID adult version (i.e.
checklist on traumatic and stressful events), 57 participants needed help
in the second part (i.e. PTSD symptoms), and 45 participants needed help
in the third part (i.e. impact of the symptoms on daily life). After the TS-ID
adult version was completed, the DITS-ID was administered, which took
approximately 60 minutes on average. This order was chosen to represent
how the screener would be used in practice. The TS-ID proxy version was
completed by a person who had regular contact with each participant. This
person received the TS-ID proxy version from the researcher, asking to read
the questionnaire instructions carefully and then fill out the TS-ID proxy
version independently.
An expert meeting was held to establish a cut-off score for TS-ID. The group
of experts consisted of four psychologists specializing in the treatment and
care of adults with MID-BIF and (suspected) PTSD. Consensus was found
that the experts would rather have people wrongly screened positive as a
result of the TS-ID score than people wrongly screened negative and not
receive further diagnostic assessment of PTSD.
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