All sites recruited both CHR individuals and healthy controls. The
study was approved by the Institutional Review Boards of all eight
NAPLS 2 sites. Informed consent was obtained from those who met
criteria and were judged fully competent to give consent. Parental consent
was obtained from parents/guardians of minors. Participants were
assigned a clinical rater who conducted all the semi-structured interviews.
Raters were experienced research clinicians. Gold standard
post-training agreement on determining the prodromal diagnoses was
excellent (kappa = 0.90) (Addington et al., 2012). Social cognition assessments
were conducted at all sites by research assistants and postdoctoral
fellows trained by J. Addington. All data in this study were collected
at the initial assessment of the NAPLS 2 project.