The Barratt Impulsiveness Scale (BIS; version 11) is a 30-item scale that measures 3 aspects of impulsivity: attentional impulsiveness, motor impulsiveness, and non-planning.68 All items are answered 1 (never), 2 (occasionally), 3 (often), or 4 (always). Separate scales were developed for adolescents and adults. Total scores were computed by summing subscale items. Data from each individual’s baseline interview were used.
