Fig. (2) Number of Proportion Altered Neuropsychological Tests in ADHD patients. Neuropsychological Tests evaluated are detailed and described in Fig. (1). We consider “altered test”, according to 1SD cut-off rule (Biederman et al., 1993). In our sample, 48.3% of ADHD patients had no neuropsychological impairment, and only 23% had impairment in one neuropsychological test, and 14.5% had two-test impairment.