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I believe the overview section is somewhat incorrect/incomplete. "One hundred-eleven infants were in the original sample; 104 took part in the follow up. Treatment was provided in 2 phases: during preschool and in the primary grades. Participants received either both phases, 1, but not both, or neither."^[1]

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I am deleting the following: "(Most recent information from Developmental Psychology, January 18, 2012, cited in uncnews.unc.edu, January 19, 2012)".

I could not find the reference. It does not seem to add anything to this article. If you disagree, please provide a complete citation, so someone else can find it.

I'm replacing that comment with a citation to Joseph Sparling; Kimberly Meunier (24 July 2019). "Abecedarian: An Early Childhood Education Approach that has a Rich History and a Vibrant Present". International Journal of Early Childhood. 51: 207–216. ISSN 0020-7187. Wikidata Q120552586.

If you think that 2012 reference should be cited in this article, please provide a citation sufficient to allow someone to find it. Thanks, DavidMCEddy (talk) 19:30, 11 July 2023 (UTC)[reply]