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. Author manuscript; available in PMC: 2009 Nov 25.

Published in final edited form as: AJNR Am J Neuroradiol. 2009 Apr 8;30(7):1308–1314. doi: 10.3174/ajnr.A1576

Scatter plots showing the relationship between the NAA/Cr ratio in the left frontal white matter and A) scores of Purdue Pegboard Right Hand (slope=0.611 year^-1; p=0.047), and between the NAA/Cr ratio in the right frontal white matter and B) SB IV-Bead Memory (slope=0.494 year^-1, p=0.032). Residuals of the test scores and NAA/Cr after regressing on age are plotted.

Scatter plots showing the relationship between the NAA/Cr ratio in the left frontal white matter and A) scores of Purdue Pegboard Right Hand (slope=0.611 year^-1; p=0.047), and between the NAA/Cr ratio in the right frontal white matter and B) SB IV-Bead Memory (slope=0.494 year^-1, p=0.032). Residuals of the test scores and NAA/Cr after regressing on age are plotted.