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Enrollment and attendance in pre-K — especially among Black and Latino preschoolers — improves when programs operate for a full school day instead of a few hours in the morning or afternoon, a new study shows.

Enrollment more than quadrupled among Black children and tripled among Latino students when the Chicago Public Schools expanded full-day pre-K, according to researchers from the Consortium for School Research at the University of Chicago. The findings also focused on an expansion effort in the city’s North Lawndale community...