en پژوهشي Original Research Articles <p style="text-align: justify;"><strong>Objectives:</strong> This research was performed to compare the results of two parental-based developmental questionnaires.</p> <p style="text-align: justify;"><strong>Methods:</strong> In this study the developmental status of 196, 4-60 months old children were screened using Ages and Stages Questionnaires (ASQ) and prescreening developmental Questionnaire (PDQ) in 4 primary health care clinics in Tehran. Convenient sampling was used. Data was analyzed by SPSS software.</p> <p style="text-align: justify;"><strong>Results:</strong> Using ASQ 18% of children were detected as having developmental disorders. Developmental screening with PDQ showed that developmental delay or doubtful condition was seen in 20% and 19% of children respectively. The estimated consistency coefficient between PDQ II and ASQ for fine and gross motor domains was 0.05 and 0.24, and for language and personal-social issues were 0.18 and 0.06, respectively. Based on two different categorizing possibilities for questionable scores of PDQ-II, that is, &quot;delayed&quot; or &quot;normal&quot;, the total agreement coefficient between two questionnaires were determined 0.30 and 0.20, respectively</p> <p style="text-align: justify;"><strong>Discussion:</strong> The process of developmental screening was changed in recent years and performing a correct and useful developmental screening is easier today. Several screening tools are available now. Recent studies showed that parental information about their child&rsquo;s development have good accuracy. For selecting a suitable tool we must consider the validity, reliability, sensitivity, specificity and all other positive and negative points about the tool of the test. Conclusion: This study showed that the results of developmental screening of 4-60 months old children in Tehran using ASQ and PDQ lead to different results. This is necessary that the results of screening are compared with a diagnostic gold standard test.</p> Developmental screening, ASQ, PDQ 3 7 http://irj.uswr.ac.ir/browse.php?a_code=A-10-1-54&slc_lang=en&sid=1 Soheila Shahshahani Yes Pediatric Neurorehabilitation Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Roshanak Vameghi No Pediatric Neurorehabilitation Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Nadia Azari No Pediatric Neurorehabilitation Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Firoozeh Sajedi No Pediatric Neurorehabilitation Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran. Anooshirvan Kazemnejad No Tarbiat Modares University, Tehran, Iran.