An item analysis of the French version of the Test for Reception of Grammar among children and adolescents with Down syndrome or intellectual disability of undifferentiated etiology
[en] Purpose: An item analysis of Bishop’s (1983) Test for Reception of Grammar (TROG) in its French version (F-TROG, Lecocq, 1996) was conducted to determine whether the difficulty of items is similar for participants with or without intellectual disability (ID).
Method: In Study 1, responses to the 92 F-TROG items by 55 participants with Down syndrome (DS), 55 with ID of undifferentiated etiology (UND) and 55 typical children (TYP) matched on their F-TROG total score were compared using the transformed item difficulties method, a statistical approach designed to detect differential item functioning (DIF) between groups. In Study 2, an additional comparison involving 526 TYP participants and 526 participants with UND was conducted to increase the statistical power of the analysis.
Results: The difficulty of items was highly similar whatever the sample size or clinical status of
participants. Fewer than 3.5 % of the items were flagged as showing DIF.
Conclusions: Tests such as the TROG can be used with confidence in clinical practice as well as in research studies comparing participants with or without ID. Methods designed for investigating potential internal test bias – such as done here – should be more regularly employed in the developmental disability field to affirm the absence of DIF.
Disciplines :
Education & instruction
Author, co-author :
Facon, Bruno
Magis, David ; Université de Liège > Département des Sciences de l'éducation > Psychométrie et édumétrie
Language :
English
Title :
An item analysis of the French version of the Test for Reception of Grammar among children and adolescents with Down syndrome or intellectual disability of undifferentiated etiology
Publication date :
2016
Journal title :
Journal of Speech, Language, and Hearing Research
ISSN :
1092-4388
eISSN :
1558-9102
Publisher :
American Speech Language Hearing Association, Rockville, United States - Maryland
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