BLOC Screening en una muestra de niños chilenos

The aim of this work was to analyse the psychometric properties of the Screening Objective and Criterial Language Battery (BLOC-S). In a sample of 228 Chilean children, levels of reliability were 0.88, 0.92, 0.76 y 0.91 for morphologic, syntactic, semantic and pragmatic modules, respectively. An exploratory factorial analysis produced unidimentional solution, explaining 30.13% of the variance. We did not find differences in performance by sex. By socio-economic status, higher status children performed better than those of middle and lower status, in all modules. Differences by age were small in all modules; producing between 3 and 4 homogeneous groups with substantial overlap. Lack of discrimination is probably related to reduce variability, due to low performance in the Chilean sample compared to Spain.