Scatter plots of age versus peak torque (Nm) in boys with DMD (filled circles, solid line) and controls (open circles, dashed line): (A) PFs (n = 22 DMD, n = 10 control), (B) DFs (n = 21 DMD, n = 10 control), and (C) KEs (n = 22 DMD, n = 10 control). Please note that in A, 2 subjects with DMD had overlapping values for plantarflexion peak torque (age 6.2y, 33.2Nm and 33.4Nm); in B, 1 subject with DMD was unable to perform the dorsiflexion torque measurement.