NEXA: Development and Preliminary Psychometric Properties of a Transdiagnostic Self-Report Measure of Neurodivergent Traits

NEXA (Neurodivergent Expression Assessment) — development and preliminary psychometric properties of a transdiagnostic self-report measure of neurodivergent traits for Brazilian Portuguese-speaking adults. N=1,002 (979 analytic), 81 items, general-factor saturation=.955 (upper bound), ECV=.497, PUC=.808, known-groups d=1.20, NEXA-SF20 (alpha=.903). Convergent validity: RAADS-R r=.727 (n=91), ASRS-18 r=.438 (n=55), AURA informant r=.43 (n=186). Preprint for Journal of Personality Assessment submission (2026-08-06). (c) 2026 NeurAtip. All rights reserved. NEXA items are proprietary; access via Research Use License Agreement.