The European Portuguese version of the Brief Negative Symptom Scale

© 2023 The Author(s). Published by S. Karger AG, Basel. Open Access License. This article is licensed under the Creative Commons Attribution 4.0 International License (CC BY). Usage, derivative works and distribution are permitted provided that proper credit is given to the author and the original publisher. Negative symptoms reflect a currently much-untreated loss of normal functioning and are frequently found in psychotic disorders. We present the first translation of the Brief Negative Symptom Scale (BNSS) to European Portuguese and evaluate its validity in a sample of Portuguese male patients with a psychotic spectrum disorder. The Portuguese BNSS showed excellent internal consistency, high convergent validity (i.e., strong correlation with the PANSS negative factor), and high discriminant validity (i.e., a lack of association with the PANSS positive factor). In sum, the present European Portuguese BNSS has shown to be reliable, thus extending this instrument's clinical availability worldwide. Research costs were supported by Fundação para a Ciência e Tecnologia (FCT) project grant LISBOA-01–0145-FEDER-030907, a Marie Curie Career Integration Grant (FP7-PEOPLE-2013-CIG 631952) and a Bial Foundation Psychophysiology Grant (292/16) awarded to DP.