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Background and Aim: Reading is undoubtedly an essential skill for everybody in these years. Reading disorders or dyslexia can cause several problems for those who suffer from them. Early assessment and diagnosis play an important role in treatment of this disorder. The main aim of this study was determining the prevalence of reading disorder in first to fifth grade elementary school students. The subbasic aim was introducing the screening Inventory Reading Test (IRT) for diagnosis of the Students with reading disorder at elementary schools.Methods: A total of 200 students (boys and girls) in five elementary education grades in Isfahan were selected through multi-stage random sampling method and assessed by IRT in 2008. Descriptive statistical analysis was performed using SPSS Software package version 13.0 for Windows.Results: This survey revealed the highest prevalence of reading disorder in the first grade male students (25%), and the lowest in fifth grade female students (0%). The incidence of dyslexia in all grades generally was 10%. The overall incidence was 66% for male students and 34% for female students.Conclusion: Reading disorder is more prevalent among male students than female students and the Inventory Reading Test is a satisfactory tool for rapid diagnosis of reading disorder.

Background and aim: Reading is one of the most essential skills in this century. Reading disorders can cause several problems for the person who has reading disorder. Early assessment and diagnosis play an important role in treatment of this disorder. The main purpose of this study was to develope a screening inventory reading test (IRT) for first to fifth grade student in Isfahan in order to early diagnosis of reading disorder.Materials and Methods: The test, consisting of 100 words context and four comprehension questions, named Inventory Reading Test (IRT), was evaluated by several speech therapists. It was standardized by testing on one thousand boys and girls, 200 students in every grade, that were selected through a multi-stage random sampling method. Test was performed on two other groups, a normal and a reading-disordered.Results: Scores of reading accuracy and velocity were highly correlated with the test total score. Test reliability was calculated as 0.77 by Cronbach`s alpha measure. There was significant difference between two groups mean score (p=0.01).Conclusion: IRT seems to be an appropriate tool for screening reading disorder of first to fifth grade students.