Using Z and age-equivalent scores to address WISC-IV floor effects for children with intellectual disability.
J Intellect Disabil Res
; 63(6): 528-538, 2019 06.
Article
em En
| MEDLINE
| ID: mdl-30637858
ABSTRACT
BACKGROUND:
The Wechsler Intelligence Scale for Children - Fourth Edition often produces floor effects in individuals with intellectual disability. Calculating respondents' Z or age-equivalent scores has been claimed to remedy this problem.METHOD:
The present study applied these methods to the Wechsler Intelligence Scale for Children - Fourth Edition scores of 198 individuals diagnosed with intellectual disability. Confirmatory factor analysis and profile analysis were conducted using a Bayesian approach.RESULTS:
The intelligence structure in intellectual disability resembled the one previously reported for typical development, suggesting configural but not metric invariance. When Z or age-equivalent scores (but not traditional scaled scores) were used, the average profile resembled the one previously reported for other neurodevelopmental disorders.CONCLUSIONS:
Both methods avoided any floor effects, generating similar but not identical profiles. Despite some practical and conceptual limitations, age-equivalent scores may be easier to interpret. This was true even for a subgroup of individuals with more severe disabilities (mean IQ < 43).Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Psicometria
/
Escalas de Wechsler
/
Deficiência Intelectual
/
Testes Neuropsicológicos
Limite:
Adolescent
/
Child
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Intellect Disabil Res
Ano de publicação:
2019
Tipo de documento:
Article