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Scatter plots of CSAmax (cm2) versus age in boys with DMD (filled circles, solid line) and controls (open circles, dashed line): (A) triceps surae (n = 22 DMD, n = 10 control), (B) tibialis anterior (n = 22 DMD, n = 10 control), and (C) quadriceps (n = 20 DMD, n = 8 control). Please note that in B, 2 subjects with DMD had overlapping values for tibialis anterior CSAmax (age 6.2y, 2.7cm 2 and 2.8cm2).
