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ERIC Number: ED550427
Record Type: Non-Journal
Publication Date: 2012
Pages: 189
Abstractor: As Provided
Reference Count: N/A
ISBN: 978-1-2678-2485-1
Validity and Diagnostic Accuracy of Scores from the Autism Diagnostic Observation Schedule-Generic
Reid, Melissa A.
ProQuest LLC, Ph.D. Dissertation, The Pennsylvania State University
The purpose of this study was to examine the internal structure, relationships with other variables, and diagnostic accuracy of scores on the Autism Diagnostic Observation Schedule-Generic (ADOS-G; Lord et al., 1999) for the purpose of diagnostic decision-making. Participants were 462 children enrolled in a public school district in the southern U.S. who were referred for a school-based psychoeducational evaluation. Four hypotheses were tested with mixed results. The first prediction was that items included in the Original Scoring Algorithm (OSA) would reflect a uni-dimensional construct, and items included in the Revised Scoring Algorithm (RSA) would reflect two constructs across modules. Exploratory factor analysis confirmed the one-factor structure of the OSA across modules. However, a two-factor structure was not retained for the Module 2 or Module 3 RSA. Second, it was predicted that total scores on the ADOS-G, across modules and scoring algorithms, would demonstrate moderate to strong relations with scores from other measures of autistic behavior, and weak relations with measures of emotional functioning. Weak relationships were consistently measured between participants' scores on the ADOS-G across modules and algorithms and other measures of autistic and emotional functioning. Third, it was predicted that scores obtained from application of the RSA would result in greater diagnostic accuracy than those obtained from the OSA. Receiver Operating Curve (ROC) analysis was conducted to determine the sensitivity and specificity of ADOS-G scores. Consistent with hypotheses, the RSA typically resulted in greater diagnostic accuracy, and a better balance between sensitivity and specificity than did the OSA. Finally, the fourth hypothesis, which predicted that the diagnostic accuracy of the ADOS-G would be lower with an independent criterion relative to an interdependent criterion, was not consistently supported. In general, results of the current study confirm the structural validity and overall diagnostic accuracy of the ADOS-G, but also highlight some of the limitations of the instrument. Despite its limitations, it was concluded that the strengths of the ADOS-G provide support for its continued use in school-based psychoeducational evaluations for the diagnosis of students with Autism Spectrum Disorders. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page:]
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Publication Type: Dissertations/Theses - Doctoral Dissertations
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Assessments and Surveys: Autism Diagnostic Observation Schedule