GAD1 and attention deficit-hyperactivity disorder: Fifteen participants had ADHD [n = 6 (43%) active, n = 9 (64%) sham], 11 had a LD [n = 6 (43%) active, n = 5 (36%) sham], and 5 had GAD [n = 3 (21%) active, n = 2 (14%) sham] (Table 2).