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FIG 6. A, Graph demonstrates the relationship between NAA concentration in the musicians and total duration of musical training and activity. NAA concentration increases significantly as the duration of total musical training and activity increases (r = 0.733 [Pearson correlation coefficient], P = .016).
B, NAA concentration aganist age of commencement (r = –0.463, P = .178).
C, NAA concentration aganist time spent for musical activities per week (r = –0.327, P = .357).
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