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Measuring behaviour disorder in mental handicap.

¹Institute of Psychiatric Demography, Psychiatric Hospital in Aarhus, Risskov, Denmark.

The British Journal of Psychiatry : the Journal of Mental Science

|September 1, 1989

Summary

The behavior section of the MRC-HBS schedule measures a single dimension of behavior disorder in adults with intellectual disabilities. This allows for meaningful scoring and comparison of treatment outcomes.

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Area of Science:

Psychiatry
Psychometrics
Clinical Psychology

Background:

Behavioral symptoms are common in adults with intellectual disabilities.
Accurate measurement of behavior is crucial for diagnosis and treatment evaluation.
The MRC-HBS schedule is a tool used to assess behavior in this population.

Purpose of the Study:

To analyze the internal validity of the behavior section of the MRC-HBS schedule.
To determine if the behavioral symptoms measured by the scale form a unidimensional structure.
To establish a meaningful quantitative index for behavior disorder.

Main Methods:

Latent-trait item analysis (Rasch model) was employed.
The internal consistency and dimensionality of the behavior section were assessed.
Data from 302 mentally-handicapped adults were analyzed.

Main Results:

The behavior section of the MRC-HBS schedule demonstrated a unidimensional structure.
Item scores can be meaningfully summed to create an index of behavior disorder.
A diagnosis of behavior disorder was identified in 17.2% of the sample.
Deviant behavior was present in 41% and correlated with factors like epilepsy and intellectual disability severity.
Organic brain damage was indicated as a significant etiological factor.

Conclusions:

The MRC-HBS behavior scale is internally valid and measures a single dimension of behavior disorder.
The derived score provides a quantitative measure for clinical use and research.
Findings suggest organic brain damage is a key factor in the etiology of behavior disorders in this population.

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