Collecting phenotypic data necessary for genetic analyses of neuropsychiatric disorders is time
consuming and costly. Development of web-based phenotype assessments would greatly improve the
efficiency and cost-effectiveness of genetic research. However, evaluating the reliability of this approach
compared to standard, in-depth clinical interviews is essential. The current study replicates and extends
a preliminary report on the utility of a web-based screen for Tourette Syndrome (TS) and common
comorbid diagnoses (obsessive compulsive disorder (OCD) and attention deficit/hyperactivity disorder
(ADHD)). A subset of individuals who completed a web-based phenotyping assessment for a TS genetic
study was invited to participate in semi-structured diagnostic clinical interviews. The data from these
interviews were used to determine participants' diagnostic status for TS, OCD, and ADHD using best
estimate procedures, which then served as the gold standard to compare diagnoses assigned using webbased
screen data. The results show high rates of agreement for TS. Kappas for OCD and ADHD diagnoses
were also high and together demonstrate the utility of this self-report data in comparison previous
diagnoses from clinicians and dimensional assessment methods