Reliability and Validity of the Diagnostic Instrument on Adaptive Behaviour: A New Instrument Measuring Adaptive Behaviour in People With Moderate, Severe or Profound Intellectual Disability.

ABSTRACT:

Background

Assessment of adaptive behaviour of people with moderate to profound intellectual disability is hampered by limited variation in scores within this range. We evaluated measurement properties of the Diagnostic Instrument on Adaptive Behaviour (DIAB), which was developed for this population.

Method

The DIAB was completed by two care staff members for 73 adults (age 19-84) grouped by level of intellectual disability (i.e., moderate, severe or profound intellectual disability) along with Dutch normed measures of adaptive and motor functioning and a global rating.

Results

Inter-rater (ICC = 0.94) and test-retest (ICC = 0.96) reliability met standards. DIAB scores correlated highly with those of the two Dutch instruments (r = 0.90; r = 0.77). Associations between

SUBMITTER: Drijver HE 

PROVIDER: S-EPMC12618112 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature