Figure 1.
(A), Episodic memory score. (B), Serial 7s. Average number of correct responses in Japan and the United States among those aged 68 years and older in episodic memory performance (sum of immediate and delayed word recall; A) and working memory performance (serial 7s; B). Means and P values for country differences can be found in Supplementary Table S1. Significant country differences at P < .05: 68 to 69, 70 to 74, 75 to 79, and 80 to 84 years (A and B).