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Reliability and Validity of the Diagnostic Instrument on Adaptive Behaviour: A New Instrument Measuring Adaptive
Hinke Elisabet Drijver1,2, Robert Didden3, Carlo Schuengel1
1Faculty of Behavioural and Movement Sciences, Section of Clinical Child and Family Studies & Amsterdam Public Health Research Institute, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands.
Journal of Applied Research in Intellectual Disabilities : JARID
|November 14, 2025
Summary
The Diagnostic Instrument on Adaptive Behaviour (DIAB) shows strong reliability and validity for assessing individuals with moderate to profound intellectual disability. This tool effectively differentiates between severity levels, aiding in accurate adaptive behavior assessment.
Area of Science:
- Psychometrics
- Developmental Psychology
- Disability Studies
Background:
- Assessing adaptive behavior in individuals with moderate to profound intellectual disability presents challenges due to limited score variation.
- The Diagnostic Instrument on Adaptive Behaviour (DIAB) was specifically developed to address this gap in assessment tools.
Purpose of the Study:
- To evaluate the measurement properties of the DIAB for individuals with moderate to profound intellectual disability.
- To determine the reliability and validity of the DIAB in this specific population.
Main Methods:
- The DIAB was administered by two care staff members to 73 adults with varying levels of intellectual disability (moderate, severe, profound).
- Data were collected alongside Dutch normed measures of adaptive and motor functioning and a global rating.
- Inter-rater and test-retest reliability were assessed using intraclass correlation coefficients (ICC).
Main Results:
- The DIAB demonstrated excellent inter-rater (ICC=0.94) and test-retest (ICC=0.96) reliability.
- DIAB scores showed high correlations with established Dutch instruments, supporting convergent validity (r=0.90; r=0.77).
- The instrument effectively distinguished between different severity levels of intellectual disability (p < 0.001), confirming known-groups validity.
Conclusions:
- The DIAB is a reliable and valid instrument for assessing adaptive behavior in individuals with moderate to profound intellectual disability.
- Its properties support its use for concurrent, discriminant, and known-groups validity.
- The DIAB shows promise for improving the assessment of adaptive functioning in this population.
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