Valerie E. Lee, J. Brooks-Gunn, Elizabeth Schnur, Fong-Ruey Liaw, Are Head Start Effects Sustained? A Longitudinal Follow-Up Comparison of Disadvantaged Children Attending Head Start, No Preschool, and Other Preschool Programs, Child Development, Vol. 61, No. 2, Special Issue on Minority Children (Apr., 1990), pp. 495-507
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Lee et al. (1990) studied this question.