Page 43 - Post-traumatic stress disorder in adults with mild intellectual disability: Screening, assessment, and brief intensive EMDR therapy

Reliability and validity of DITS-ID
correlation coefficients were interpreted using the criteria of Funder and
Ozer (2019).
Results
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Descriptive Statistics
Of the 97 participants, 85 (88%) reported at least one A-criterion event in
their life and 56 of them (58%) were classified with PTSD using the DITS-
ID-adults. Table 1 lists the five event questions for which Criterion A was
identified most often. Cronbach’s alpha for the DITS-ID-adults total score
(sum of yes scores) on the symptom section was .86, which indicates good
internal consistency.
Table 1. Five most often cited potentially traumatic events.
Did someone ever touch your body even though you didn’t want this? Did someone ever hit you repeatedly or hurt you severely? Have you ever seen someone being threatened or maltreated (beating,
kicking, shooting, stabbing, going at someone’s throat)?
Did you ever experience a serious accident or a fire? Have you ever been forced to touch someone’s body parts when you
really didn’t want to
Number of times
mentioned
44 (45%)
33 (34%)
32 (33%)
21 (22%)
20 (21%)
Interrater Reliability
The interrater reliability for almost all items that tapped into whether
participants had been exposed to a particular event (29 items; yes, no, other)
was excellent (ҡ = .76–1.00). For one item of the event section (i.e., item 12:
“Did you ever see someone else being forced to have sex?”) the interrater
reliability was medium (ҡ = 0.48). The fact that kappa was lower for this
item was likely due to the skewed distribution because the percentage of
agreement on this item was high (94%). Kappa coefficients for fulfillment of
the A-criterion were excellent (ҡ = 0.77–1.00). The interrater reliability of 43
symptom-items was good to excellent (ҡ = 0.64–1.00). Finally, the interrater
reliability of the PTSD classification (yes/no) was excellent (ҡ = 1.00).
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