Predicting Reading Difficulty in First Grade Using Dynamic Assessment of Decoding in Early Kindergarten: A Large-Scale Longitudinal Study.

The purpose of this study was to examine and compare the classification accuracy of early static prereading measures and early dynamic assessment reading measures administered to 600 kindergarten students. At the beginning of kindergarten, all of the participants were administered two commonly used static prereading measures. The participants were then administered either a dynamic assessment featuring an onset-rime decoding strategy or a dynamic assessment featuring a sound-by-sound strategy. At the end of first grade, those same participants' reading ability was assessed using multiple reading measures. Results indicated that the dynamic assessments yielded significantly higher classification accuracy over the static measures, but that the classification accuracy of the two dynamic assessments did not differ significantly. Sensitivity for the static measures was less than 80%, and specificity ranged from 33% to 51%. The sensitivity and specificity for the dynamic assessments was greater than 80% for all children, with the exception of specificity for the Hispanic children, which was at or greater than 70%. Results also indicated that the combination of static and dynamic measures did not improve the classification accuracy over the dynamic assessments alone. Dynamic assessment appears to be a promising approach to classifying young children at risk for future reading difficulty. © Hammill Institute on Disabilities 2014.