College of Science and Health Theses and Dissertations

Date of Award

Fall 11-24-2015

Degree Type


Degree Name

Doctor of Philosophy (PhD)



First Advisor

Kathryn E. Grant, PhD

Second Advisor

Jocelyn Carter, PhD


The current study seeks to explore whether a transdisciplinary clinic is accurate in their diagnosis of ASD prior to the age of three. Participants in the current study consist of 34 children aged 13 to 36 months who were evaluated by a transdisciplinary clinic between 2007 and 2009. Participants were reassessed using the ADOS and ADI-R once the child is over the age of three. The diagnoses from the two time points was compared to determine the accuracy and reliability of the diagnosis assigned by the transdisciplinary clinic prior to the age of three.

Overall, diagnostic stability was high between the different time points and diagnostic methods. Specifically, inter-rater reliability was found to be 82.35% with a Kappa coefficient of .62. This suggests that the transdisciplinary clinic is a reliable and valid method of diagnosing ASD prior to the age of 3.

SLP Collection