This study examined the psychometric properties of the 35-item Keshev-A, one of the first adult ADHD screening questionnaires to include indirect questioning and retrospective school-age indicators. A sample of 1,668 volunteers completed the new scale and the ASRS-v1.1. The internal consistency of the Keshev-A’s composite score was excellent (α = 0.94), as was that of each of the eight content-based subscales (α = .70 to .85). An exploratory factor analysis (EFA; n = 904) using principal axis…
