Elsevier

Research in Developmental Disabilities

Volume 32, Issue 6, November–December 2011, Pages 2309-2320
Research in Developmental Disabilities

Psychometric properties of the Aberrant Behavior Checklist, the Anxiety, Depression and Mood Scale, the Assessment of Dual Diagnosis and the Social Performance Survey Schedule in adults with intellectual disabilities

https://doi.org/10.1016/j.ridd.2011.07.035Get rights and content

Abstract

Progress in clinical research and in empirically supported interventions in the area of psychopathology in intellectual disabilities (ID) depends on high-quality assessment instruments. To this end, psychometric properties of four instruments were examined: the Aberrant Behavior Checklist (ABC), the Assessment of Dual Diagnosis (ADD), the Anxiety, Depression and Mood Scale (ADAMS), and the Social Performance Survey Schedule (SPSS). Data were collected in two community-based groups of adults with mild to profound ID (n = 263). Subscale reliability (internal consistency) ranged from fair to excellent for the ABC, the ADAMS, and the SPSS (mean coefficient α across ABC subscales was .87 (ranging from fair to excellent), the ADAMS subscales .83 (ranging from fair to good), and the SPSS subscales .91 (range from good to excellent). The ADD subscales had generally lower reliability scores with a mean of .59 (ranging from unacceptable to good). Convergent and discriminant validity was determined by bivariate Spearman ρ correlations between subscales of one instrument and the subscales of the other three instruments. For the most part, all four instruments showed solid convergent and discriminant validity. To examine the factorial validity, Confirmatory Factor Analyses (CFA) were attempted with the inter-item covariance matrix of each instrument. Generally, the data did not show good fits with the measurement models for the SPSS, ABC, or the ADAMS (CFA analyses with the ADD would not converge). However, most of the items on these three instruments had significant loadings on their respective factors.

Highlights

► We examined the psychometrics of the ABC, the ADD, the ADAMS, and the SPSS. ► Data were collected in two community groups of adults with mild to profound ID. ► Internal consistencies ranged from fair to excellent for the ABC, ADAMS, and SPSS. ► All instruments evidenced relatively solid convergent and discriminant validity. ► CFA did not suggest good fits, but most items loaded significantly on their factor.

Section snippets

Participants

A total of 263 (174 male, 89 female) individuals were assessed with these four measures. Of these, 24% had mild, 34.6% moderate, 23.3% severe, and 17.5% profound intellectual disability (two participant's level of functioning was unavailable). The gender distribution between the two study groups was not statistically different, however, the groups differed in terms of the distribution of ID levels (Pearson χ2[3] = 22.9, p < .000). Group 1 had a larger proportion of individuals with mild and

Results

Data were analysed using SPSS 17.0 for Windows and Lisrel 8.72.

Discussion

The data set of this study consisted of two groups of adults of all levels of ID who resided in the community. While Group 2 represented individuals who were served by training and rehabilitation program, Group 1 was a clinical sample receiving outpatient services. The difference between the type of groups was substantiated insofar as Group 2 had relatively higher mean scores on the two socially acceptable behavior subscales (SPSS Social Skills and Communication), while Group 1 had relatively

Acknowledgements

The authors wish to acknowledge the contributions of Dr. Michel Sherer in data collection, Dr. Theodore Hoch for his assistance in the initial development of the study protocol, and Camelia Mircea and Rebecca H. Zaja for data management during earlier periods of the study.

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