Contraction time. Box and whisker plot showing that (A) the old group had a significantly (p<.001) longer contraction time and radiation treatment was associated with significantly (p<.001) longer contraction time in both age groups with medial nerve stimulation, and (B) that both age and radiation were associated with significantly (p<.001 and p = .009, respectively) longer contraction times with medial nerve stimulation. Boxes depict the interquartile range (IQR), with a line at the median. Whiskers extend to the last observation within 1.5x the IQR. The closed circles are observations beyond 1.5x the IQR.Y = Young Adult Control; YR = Young Adult Radiated; O = Old Control, OR = Old Radiated.