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In The State of Preschool, 2003 State Preschool Yearbook, the National Institute for Early Education Research estimates, by state, the percentage of 4-year-olds in state-sponsored prekindergarten.
Note: NIEER estimated enrollments by age categories when states did not provide data separately for 3- and 4-year-olds.
SOURCE: U.S. Government Accountability Office
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