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Psychometric Properties of the Questionnaire Epistemic Trust in People With Mild to Moderate Intellectual
Suzanne D M Derks1, Annelies de Bildt2,3,4, Veerle M M Andries5
1Department of Clinical Child and Family Studies & Amsterdam Public Health, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
Background:
To assess epistemic trust in people with intellectual disabilities, we adapted the Questionnaire Epistemic Trust (QET) for people with mild to moderate intellectual disabilities or borderline intellectual functioning (MMID/BIF).
Method:
We investigated the factor structure, the reliability and construct validity in 147 adults.
Results:
We replicated the 4-factor structure, after excluding four items with low factor loadings. Internal consistency was α = 0.58 for Hypervigilance, and ranged from α = 0.74 to 0.81 for the other subscales. Subscale test-retest reliability ranged from 0.504 to 0.747. No convergent validity was found with the Reflective Functioning Questionnaire (RFQ). Discriminant validity was confirmed with the Scale of Emotional Development-Questionnaire (SED-Q), Scale of Emotional Development-Short (SED-S) and Autism Spectrum Quotient-10 (AQ-10), but not with General Social Trust (GST).
Discussion:
The QET is promising for assessing epistemic trust of people with MMID/BIF at subscale level. Refining the items with a figurative expression seems needed.
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