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Notes
1. We surveyed the 263 articles published in 2012 by eight leading mathematics education journals (Educational Studies in Mathematics, For the Learning of Mathematics, Journal of Mathematical Behavior, Journal of Mathematics Teacher Education, Journal for Research in Mathematics Education, Mathematical Thinking and Learning, Research in Mathematics Education and ZDM). Studies were classified as being experimental if random assignment was used at the same level as the unit of analysis. A total of 8 articles fell into this category.