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Constructs Assessed by the GARS-2: Factor Analysis of Data from the Standardization Sample
Ist Teil von
Journal of autism and developmental disorders, 2010-09, Vol.40 (9), p.1118-1130
Ort / Verlag
Boston: Springer US
Erscheinungsjahr
2010
Link zum Volltext
Quelle
Psychology & Behavioral Sciences Collection
Beschreibungen/Notizen
The GARS-2 (Gilliam
2006
) is widely used for autism screening; however, the validity of its three conceptually-derived subscales has not been evaluated. In this study, exploratory (EFA) and confirmatory (CFA) factor analyses of data from matched subgroups of the standardization sample did not support the GARS-2 subscale structure. EFAs identified four factors in the model development subgroup (
n
= 496):
stereotyped/repetitive behavior
,
stereotyped/idiosyncratic language
,
word use problems
, and
social impairment
. CFAs supported this model in the replication subgroup (
n
= 494). Findings suggest that the GARS-2 subscales have limited clinical utility and that the Autism Index should be interpreted with caution. Although more research is needed, the clinical utility of the four empirically-derived scales may be limited by factors related to item content and test development procedures.