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Early intervention programs under Part C of the Individuals with Disability Education Act serve a developmentally heterogeneous population of children ages birth to 36 months,. Applying mixture modeling to developmental assessment data from 1513 children who participated in a large, urban early intervention program, we identified four subgroups of children with distinct developmental profiles. Children's developmental trajectories differed by subgroup; children in the subgroup displaying severe delays in communication, with less severe delays in other areas of functioning, had the highest likelihood of persistent delays. Our study describes the identified subgroups and suggests implications for clinical practice and service planning.
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