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Development and standardization of the DALI-DAB (dyslexia assessment for languages of India - dyslexia assessment battery). | LitMetric
A majority of Indian schoolchildren are biliterate in that they acquire literacy in at least two language systems, necessitating dyslexia assessment in both. The DALI-DAB assesses risk for dyslexia by evaluating reading ability and literacy-learning potential through a battery including literacy tests (letter and word reading, spelling, nonword reading, reading comprehension), and mediator skills (phonological awareness, processing automaticity and executive fluency, oral language) in multiple languages. DALI-DAB was developed in three languages - English, Hindi, and Marathi - and standardized on a sample of 1013 children. Reliability analyses revealed high internal consistency (α > 0.8) in most tests in all three languages. Low standard error of measurement values supported DALI-DAB score stability over repeated testing. Construct validity was variously reinforced through, (i) selection of culture-referenced, research-based tests, (ii) approval of test materials by schoolteachers (face validity) and (iii) grade-correlated performance increases on all DALI-DAB tests, besides robust correlations between (iv) literacy and mediator skill test scores (p < .001, concurrent validity), (v) equivalent tests across languages (p < .01, convergent validity), and (vi) DALI-DAB and WJ III ACH literacy scores (p < .01, criterion validity), in contrast to (vii) low correlation between DALI-DAB and WJ III ACH math scores (p > .05, discriminant validity). Overall, the DALI-DAB represents the first standardized dyslexia assessment tool for bilingual-biliterate children.
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