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AFAIK, Abcedarian project wasn't a randomized study; I'm not sure.

You are incorrect.

"This program was evaluated in one randomized controlled trial of 111 participating children, followed through 21 years of age."

Here's a nice article that summarizes a recent article that came out on the participants, who are still being followed. Very few programs get results like this.

http://uncnews.unc.edu/content/view/5032/107/

Last edited by ultramarina; 07/12/12 10:23 AM.