We report here cognitive and academic outcome measures at ages 12 and 16 for approximately 80% of a sample of 205 children who had been randomly assigned to 2 programs for developmentally delayed preschoolers, Direct Instruction (DI) and Mediated Learning (ML). There were no main effect differences between programs, but there were aptitude-by-treatment interactions similar to those found earlier: initially lower functioning students benefited more from the ML program, whereas initially higher functioning students benefited more from the DI program. Multiple regression analyses suggested that lower scores on cognitive and academic achievement measures are associated with greater experience in special education, even controlling for preschool period ability measures, gender, and ethnicity. The challenges of interpreting this result are discussed.
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