Validity and utility of the PANSS negative symptoms factor score as a clinical trial outcome

Validity and utility of the PANSS negative symptoms factor score as a clinical trial outcome☆ Chris J. Edgar , Thomas Blaettler , Dragana Bugarski-Kirola , Stephanie Le Scouiller , George M. Garibaldi , Stephen R. Marder d a Roche Products Ltd., United Kingdom b Department of Neuroscience, F. Hoffmann-La Roche, Switzerland c F. Hoffmann-La Roche, Switzerland d Desert Pacific Mental Illness Research, Education, and Clinical Center, Semel Institute for Neuroscience at UCLA, United States