en پژوهشي اصیل Original Research <p><strong>Background and Objective</strong><strong>:</strong></p> <p><strong>Background:</strong> The present study investigates the relationship between attention deficit hyperactive disorder (ADHD) and the severity of symptoms in children with autistic spectrum disorder.</p> <p><strong>Methods</strong>: The study was conducted on 80 patients with autistic spectrum disorder visiting Child Psychiatric Clinic of Tehran Psychiatric Institute. The severity of autistic symptoms was measured by sensory profile questionnaire. The Conners&#39; Adult ADHD Rating Scales&ndash;Self Report: Screening Version (<strong>CAARS</strong>&ndash;<strong>S</strong>:<strong>SV</strong>) and CSI questionnaire were used to determine the severity of ADHD. The data were analyzed using Pearson correlation coefficient through SPSS v.20.</p> <p><strong>Findings</strong>: There is a significant correlation between total scores of Sensory profile and its subscales and total scores of CAARS and CSI (r >+0.5, P<0.001). However, there was not any significant correlation between some subscales of sensory profile questionnaire and the scores of CAARS. These subscales include visual sensitivity (r: + 0.18) and sensory processing in connection with tone/strength (r: +0.17). Also, there was not any significant correlation between the subscale of adjustment in relation to posture/movement processing and total score of sensory profile and CSI (r: +0.22).</p> <p><strong>Conclusion</strong>: There is a significant correlation between ADHD and severity of symptoms of autistic spectrum disorder. Both disorders can increase the severity of symptoms and exacerbate the patients&rsquo; recovery process</p> <p></p> Attention deficit hyperactive disorder, Autistic spectrum disorder, CAARS, Sensory profile questionnaire, CSI 14 19 http://ijca.iums.ac.ir/browse.php?a_code=A-10-39-1&slc_lang=en&sid=1 Hasan Ranjbar 1003194753284600381 1003194753284600381 No Iran University of Medical Sciences, Tehran, Iran Mitra Hakim shooshtari hakim@gmail.com 1003194753284600382 1003194753284600382 Yes Tehran, Iran, corresponding author, mItra Hadi Zarafshan 1003194753284600383 1003194753284600383 No Tehran, Iran, corresponding author, mItra Mohamad Reza Najarzadehgan 1003194753284600384 1003194753284600384 No Iran University of Medical Sciences, Tehran, Iran Elham shirazi 1003194753284600385 1003194753284600385 No Iran University of Medical Sciences, Tehran, Iran Mohamadian 1003194753284600386 1003194753284600386 No Iran University of Medical Sciences, Tehran, Iran