In this study of Oklahoma's universal pre-K program, the authors relied on a strict birthday eligibility criterion to compare "young" kindergarten children who just completed pre-K to "old" pre-K children just beginning pre-K. This regression-discontinuity design reduces the threat of selection bias. Their sample consisted of 1,567 pre-K children and 1,461 kindergarten children who had just completed pre-K. The authors estimated the impact of the pre-K treatment on Woodcock-Johnson Achievement test scores. The authors found test impacts of 3.00 points (0.79 of the standard deviation for the control group) for the Letter-Word Identification score, 1.86 points (0.64 of the standard deviation of the control group) for the Spelling score, and 1.94 points (0.38 of the standard deviation of the control group) for the Applied Problems score. Hispanic, Black, White, and Native American children all benefit from the program, as do children in diverse income brackets, as measured by school lunch eligibility status. The authors conclude that Oklahoma's universal pre-K program has succeeded in enhancing the school readiness of a diverse group of children.

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Objective. The objective of this work is to determine how much Hispanics benefit from a high‐quality pre‐K program and which Hispanic students benefit the most. Methods. Hispanic students in Tulsa, Oklahoma were tested (in English, Spanish) in August 2006. A regression discontinuity design addressed potential selection bias by comparing pre‐K alumni (treatment group) with pre‐K entrants (control group), controlling for age and other demographic variables. Results. Hispanic students experienced substantial improvements in prereading, prewriting, and premath skills. Hispanic students whose parents speak Spanish at home or whose parents were born in Mexico benefited the most. English‐language test gains were stronger than Spanish‐language test gains, but the latter were sometimes significant. Conclusions. Preschool education has considerable potential to improve educational outcomes for Hispanic children.