Suitability of a Self-report Questionnaire to Assess Adaptive Functioning for Persons With Intellectual Disability

Study Overview
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Brief Summary
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In the proposed study, the investigators aim to investigate whether the existing ABAS-3 self-report questionnaire is suitable to be completed meaningfully by individuals who are perceived as having mild intellectual disability (55<IQ<85) based on cognitive impairment. Based on the participants' experiences and researchers' expertise, the investigators develop a 'more inclusive' self-report version. The investigators then look at the extent to which participants indicate that they understand this version better, based on user experiences and limited psychometric research. In doing so, the investigators also compare the outcomes of the self-report and informant-report variant.

Official Title
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How to Improve the Possibilities for Self-reporting Adaptive Functioning for Persons With Mild Intellectual Disability or Borderline Intellectual Functioning With the ABAS-3?

Conditions
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Mild Intellectual Disability, Borderline Intellectual Functioning

Intervention / Treatment
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* Diagnostic Test: Adaptive functioning self-report questionnaire
* Diagnostic Test: Adaptive functioning self-report questionnaire - adapted


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age 18 years or older Last known Total Intelligence Quotient (TIQ) 55 - 85 Receiving support from a care organization for persons with ID. A care worker who knows the participant for at least a year and knows him well enough tot complete the informant version of the ABAS-3 is available. Exclusion Criteria: • Severe physical or sensory impairment limiting ability to participate.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Supportive Care
Intervention Model: Single Group Assignment
Interventional Model Description: A mixed-method repeated-measures design will be used: data are collected using both qualitative and quantitative methods at two points in time (before and after adaptation) from the same participants.
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Experimental<br>Persons with Mild Intellectual Disability (MID) or Borderline Intellectual Functioning (BIF) complete the ABAS-3 in assisted form on two occasions: the original version the first time and an adapted version after a few weeks. | Diagnostic Test: Adaptive functioning self-report questionnaire<br>* A self-report questionnaire for assessing level of adaptive functioning<br>Diagnostic Test: Adaptive functioning self-report questionnaire - adapted<br>* A self-report questionnaire for assessing level of adaptive functioning, adapted to the communication level of the participant<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Text comprehension - HyTeC T0 | Level of verbal understanding of instructions and questions in the ABAS-3 (Adaptive Behaviour Assessment System - Third Edition) questionnaire - results from HyTeC-cloze tests. The HyTeC-cloze (Hybrid Text Comprehension cloze) is a test to assess the level of text comprehension for a body of text. | At baseline (T0) | 
| Text comprehension - HyTeC T1 | Level of verbal understanding of instructions and questions in an adapted version of the ABAS-3 (Adaptive Behaviour Assessment System - Third Edition) questionnaire - results from HyTeC-cloze tests. The HyTeC-cloze (Hybrid Text Comprehension cloze) is a test to assess the level of text comprehension for a body of text. | Approximately 8 weeks after baseline (T1) | 
| Text comprehension - missings T0 | Level of verbal understanding of questions in the ABAS-3 (Adaptive Behaviour Assessment System - Third Edition) questionnaire. Outcomes are 1. number of missing (unscored) items (min 0 - max 30), 2. number of 'don't know' answers (min 0 - max 30) and 3. a composite score of 1 and 2. | At baseline (T0) | 
| Text comprehension - missings T1 | Level of verbal understanding of questions in an adapted version of the ABAS-3 (Adaptive Behaviour Assessment System - Third Edition) questionnaire. Outcomes are 1. number of missing (unscored) items (min 0 - max 30), 2. number of 'don't know' answers (min 0 - max 30) and 3. a composite score of 1 and 2. | Approximately 8 weeks after baseline (T1) | 
| Text comprehension - cognitive interviews T0 | Level of verbal understanding of questions in the questionnaire - qualitative analysis of answers from cognitive interviews during assessment of the ABAS-3 (Adaptive Behaviour Assessment System - Third Edition). | At baseline (T0) | 
| Text comprehension - cognitive interviews T1 | Level of verbal understanding of questions in the questionnaire - qualitative analysis of answers from cognitive interviews during assessment of an adapted version of the ABAS-3 (Adaptive Behaviour Assessment System - Third Edition). | Approximately 8 weeks after baseline (T1) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Self-reported Adaptive Functioning - original ABAS-3 scores | The ABAS-3 (Adaptive Behaviour Assessment System - Third Edition) is an observational scale that measures adaptive behaviour. Both self-report and informant report versions are available. In the context of the current study, a 30-item abbreviated version is used. Composite scores are calculated: a total score and three domain scores (conceptual, social and practical domain). Scores range from 0-90 for the total scale and 0-30 for each domain scale. Higher scores indicate better adaptive functioning. | At baseline (T0) | 
| Self-reported Adaptive Functioning - adapted ABAS-3 scores | The ABAS-3 (Adaptive Behaviour Assessment System - Third Edition) is an observational scale that measures adaptive behaviour. Both self-report and informant report versions are available. In the context of the current study, a 30-item abbreviated version is used. Composite scores are calculated: a total score and three domain scores (conceptual, social and practical domain). Scores range from 0-90 for the total scale and 0-30 for each domain scale. Higher scores indicate better adaptive functioning. The second time participants complete the ABAS (approximately 8 weeks after baseline, T1), an adapted version is used, with language and design adapted to the comprehension level of participants according to the outcomes at baseline (T0). | Approximately 8 weeks after baseline (T1) | 
| Informant-reported Adaptive Functioning - adapted ABAS-3 scores | The ABAS-3 (Adaptive Behaviour Assessment System - Third Edition) is an observational scale that measures adaptive behaviour. Both self-report and informant report versions are available. In the context of the current study, a 30-item abbreviated version is used. Composite scores are calculated: a total score and three domain scores (conceptual, social and practical domain). Scores range from 0-90 for the total scale and 0-30 for each domain scale. Higher scores indicate better adaptive functioning. For the informant-report an adapted version of the original is used; the adaptations for the self-report version are replicated for the informant version. | Approximately 8 weeks after baseline (T1) | 
| Self-reported Adaptive functioning - SCAF | The SCAF (Screener for Adaptive Functioning) is a screening questionnaire for adaptive functioning for individuals who may have MID or BIF. The SCAF yields a total AF score (min 0 - max 24), with higher scores indicating better adaptive functioning. | At baseline (T0) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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self-report questionnaires, inclusive diagnostics, easy-read language, adaptive functioning