Half decay time. Box and whisker plot showing that (A) the old control group had significantly (p<.001) longer half-decay time than the young control group with whole nerve stimulation, and (B) radiation treatment was associated with significantly (p<.001) longer half decay time in both age groups 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.