Assessment of the Psychometric Properties of the New Version of Tehran- Stanford- Binet Intelligence Scale in Children with Dyslexia

Background: Cognitive abilities assessment, is considered to be one of the most complicated and controversial issues in psychological tests. In spite of great usage of new version of Tehran- Stanford- Binet intelligence scale in screening and diagnosis, they have not made so many endeavors to use this valid test in our country and little researches have been conducted to survey psychometric characteristics of mentioned scale. Given the above considerations, the aim of this study is to investigate Tehran-Stanford-Binet intelligence scale psychometric characteristics in dyslectic children.

Materials and Methods: In this psychometric study with classical approach, the statistical society was all the students with dyslexia in the elementary schools of Tehran provinces in 1390. The sample size was equal with 120 students with dyslexia who were selected based on purposive sampling. The new version of Tehran-Stanford-Binet intelligence Scale which includes 10 subtests in verbal and nonverbal domains (fluid reasoning, knowledge, quantitative reasoning, visual spatial processing and working memory and eight IQ) was used for them. Findings highlight characteristics of this tool is its ability to calculate the combined scores connected to the reading skills. ROC curve methods, kronbach alpha and pearson correlation was used to analyze the data.

Results: Result show that SB5 Test has a good reliability and diagnostic validity. It has 98% sensitivity and a desirable potential to identify student with dyslexia (72%).

Conclusion: SB5 could be used as an identificationtoal test for dyslexia.