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Title: Psychometric properties of instruments used in intellectual disabilities
Author: Saleem, Majid
ISNI:       0000 0004 5992 2632
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2016
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Literature review: The aim of the current review was to systematically assess the quality of multi-trait measures of psychological distress and psychiatric symptoms, which have been used with adults with intellectual disabilities. Seven multi-trait measures of psychological distress and psychiatric symptoms were identified and their psychometric properties were appraised. Results showed that all multi-trait measures had high levels of internal consistency with only some measures reporting moderate to good levels of inter-rater and test/retest reliability. The assessment of validity of the multi-trait measures was shown to be lacking with number and quality of assessments varying across all of the measures. There was also limited information on acceptability, feasibility and precision of the measures. Findings are discussed in relation to these factors. Methodological limitations and recommendations for clinical practice and future research are outlined. Empirical report: The aim of the current study was to investigate the factor structure of the WAIS-IV with an intellectual disabilities population in the UK. In addition the relationship between IQ and adaptive functioning was examined. Results showed that the only factor structure that can be reliably applied for this population is a two-factor solution of verbal-performance. It was also found that there is a positive albeit small correlation between full scale IQ and adaptive behaviour composite and a larger correlation between full scale IQ and daily living skills. There were no correlations between full scale IQ and communication or full scale IQ and socialisation These results provide some evidence that the WAIS-IV and the Vineland-II assess different sets of skills and behaviours. The clinical implications of these findings are discussed alongside future research recommendations.
Supervisor: Beail, Nigel Sponsor: Not available
Qualification Name: Thesis (D.Clin.Psy.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available