These robust psychometric properties support the use of this tool in future national studies on child development. ![]() 90 and stability for fine motor scale only. The Bailey-III demonstrated good internal consistency with alpha coefficients greater than or equal to. Exploratory factor analyses showed a single component explaining 86% of the variance, supported by goodness-of-fit indexes in confirmatory factor analysis. Evidence of convergent validity was obtained from correlations of the Bayley-III with the: Peabody Developmental Motor Scale 2, Leiter International Performance Scale-R, Expressive Vocabulary Assessment List and Peabody Picture Vocabulary Test. It was translated into Brazilian Portuguese, culturally adapted and tested on 207 children (12-42 months of age). ![]() This study investigated the psychometric properties of the Bayley Scales of Infant Development, Third Edition (Bayley-III). In Brazil, there is a lack of standardized instruments to evaluate young children. Scales with evidence of validity and reliability are important to evaluate child development.
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