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The CSRP program was evaluated through a cluster-randomized design, and Head Start sites were recruited based on four criteria: 1) receipt of federal Head Start funding; 2) having two or more classrooms that offered full-day classes; 3) location in a set of high-poverty Chicago neighborhoods that contained high crime rates, low rates of mobility, and a substantial portion of families living below the poverty line; 4) completion of a screening self-nomination procedure [3].
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