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. Author manuscript; available in PMC: 2009 Jan 8.
Published in final edited form as: Intelligence. 2008;36(5):464–486. doi: 10.1016/j.intell.2007.10.003

Figure 2.

Figure 2

Means and standard errors of z-scores for each reference cognitive variable as a function of decade in Study 1. The data points for the oldest decade are based on between 30 and 40 individuals but all of the other points are based on at least 90 individuals.