How to Cite This Article: Azari. N, Soleimani F, Vameghi R, Sajedi F, Shahshahani S, Karimi H, Kraskian A, Shahrokhi A, Teymouri R, Gharib M. A Psychometric Study of the Bayley Scales of Infant and Toddler Development in Persian Language Children. Iran J Child Neurol. Winter 2017; 11(1):50-56.AbstractObjectiveBayley Scales of infant & toddler development is a well-known diagnostic developmental assessment tool for children aged 1–42 months. Our aim was investigating the validity & reliability of this scale in Persian speaking children.Materials & MethodsThe method was descriptive-analytic. Translation- back translation and cultural adaptation was done. Content & face validity of translated scale was determined by experts’ opinions. Overall, 403 children aged 1 to 42 months were recruited from health centers of Tehran, Iran during years of 2013- 2014 for developmental assessment in cognitive, communicative (receptive & expressive) and motor (fine & gross) domains. Reliability of scale was calculated through three methods; internal consistency using Cronbach’s alpha coefficient, test-retest and interrater methods. Construct validity was calculated using factor analysis and comparison of the mean scores methods.ResultsCultural and linguistic changes were made in items of all domains especially on communication subscale. Content and face validity of the test were approved by experts’ opinions. Cronbach’s alpha coefficient was above 0.74 in all domains.Pearson correlation coefficient in various domains, were ≥ 0.982 in test retest method, and ≥0.993 in inter-rater method. Construct validity of the test was approved by factor analysis. Moreover, the mean scores for the different age groups were compared and statistically significant differences were observed between mean scores of different age groups, that confirms validity of the test.ConclusionThe Bayley Scales of Infant and Toddler Development is a valid and reliable tool for child developmental assessment in Persian language children.References1. Boyle CA, Boulet S, Schieve LA, Cohen RA, Blumberg SJ, Yeargin-Allsopp M, et al. Trends in the prevalence of developmental disabilities in US children, 1997–2008. Pediatrics 2011:peds. 2010-989.2. Sajedi F, Doulabi MA, Vameghi R, Baghban AA, Mazaheri MA, Mahmodi Z, et al. Development of Children in Iran: A Systematic Review and Meta-Analysis. Glob J Health Sci 2015 Dec 18;8(8):51251.3. Soleimani F, Vameghi R, Biglarian A, Rahgozar M. Prevalence of motor developmental disorders in children in Alborz Province, Iran in 2010. Iran Red Crescent Med J 2014 Dec 25;16(12):e16711.4. Soleimani F, Vameghi R, Biglarian A. 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