Özet:

In this study, it was aimed to conduct a validity and reliability study of the Mullen Early Learning Scale developed by Mullen (1995) to determine the developmental levels of 0-68 month-old infants and children for 13-44 month-old infants and children. The study group consisted of 365 infants/children aged 13-44 months who did not have any developmental delay diagnosis came to Family Health Centers in Sivas city center. In the adaptation study of Mullen Early Learning Scale, language and content validity studies were carried out. Principal component analysis, estimations of item parameters and parameter invariance were examined for construct validity. As a result of the eigenvalue and explained variance ratios obtained as a result of principal components analysis, it was revealed that the sub-dimensions were unidimensional and therefore locally independent. With the estimation of item parameters, the easiest and most difficult items were determined for the sub-dimensions of the scale. Parameter invariance was ensured because the parameter invariance was above 70% of the correlation coefficients. According to the Classical Test Theory for reliability, Cronbach's Alpha coefficient and test-retest reliability coefficient were calculated according to the Item Response Theory, and the marginal reliability and empirical reliability coefficients were calculated. Cronbach's Alpha coefficients of the sub-dimensions of the scale were >0.93; test-retest coefficients >0.96; marginal reliability coefficients >0.66; empirical reliability coefficients were found to be >0.94 and test-retest reliability coefficients were found to be >0.96. The findings show that the Mullen Early Learning Scale can be used as a valid and reliable measurement tool for infants/children aged 13-44 months.

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