The present study investigated the validity of Minnesota Multiphasic Personality Inventory-Second Edition (MMPI-2) for clients with Attention-DeficitiHyperactivity Disorder (ADHD). Scores for three validity and nine clinical scales were compared in two phases. First, two matched samples were compared (N = 17 per group), clients with 2 . ADHD only and clients with mixed distress only. Overall analyses indicated no significant differences between the groups' raw scores; the mean T-scores for the ADHD group were in the normal range (i.e. < 65). Second, three unmatched samples were compared: (1.) clients with ADHD only (N = 19), (2.) clients with mixed distress only (N = 95), and (3.) clients with comorbid ADHD and mixed distress (N = 14). Analyses indicated one significant raw score difference on scale Pa, on which the comorbid group scored significantly higher than the ADHD only group. The mean T-scores for the ADHD group were in the normal range while mean T -scores for the comorbid group were clinically elevated on six scales. These findings indicate that, as a group, individuals with ADHD do not have significantly elevated scores on theMMPI-2.
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