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  • Title: Psychometric properties and validation of Portuguese version of Ages & Stages Questionnaires (3rd edition): 9, 18 and 30 Questionnaires.
    Author: Lopes S, Graça P, Teixeira S, Serrano AM, Squires J.
    Journal: Early Hum Dev; 2015 Sep; 91(9):527-33. PubMed ID: 26162639.
    Abstract:
    BACKGROUND: The essential underlying foundations of Early Intervention (EI), in which parents/family play a critical role in their child's development, leads us to conclude that their contribution assessing early detection of problems is fundamental. The Ages & Stages Questionnaires (ASQ) is a standardized screening instrument that has been successfully studied in different countries and cultures. AIMS: Translate and study the psychometrics proprieties of the Portuguese version of the 9, 18 and 30month questionnaires of the Ages and Stages Questionnaires, 3rd edition (ASQ-3). STUDY DESIGN: Cross-sectional study. SUBJECTS: Validity and reliability were studied in a sample of 234 parents of children within 9, 18 and 30months. RESULTS: The results indicated that the questionnaires had good internal consistency, strong agreement between observers and between observations with two weeks interval, and strong Pearson product-moment correlation coefficients between the overall and the total for each domain. The cutoff points (i.e. 2 standard deviations below the mean domain score), that identifies children who should receive further referral for more comprehensive assessment, were close to those determined in the original ASQ-3 psychometric studies. Cronbach's alpha ranging from .42 to .70 and Pearson's r values varies from .22 to .60. CONCLUSIONS: Although some weaknesses were noted in psychometric qualities analysis, it can be concluded that the ASQ-PT of 9, 18 and 30months of age fulfills the requirements of a screening tool validated for the Portuguese population. PRACTICE IMPLICATIONS: To allow the early identification of children with developmental problems.
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