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Figure 3. Change in mean step activity by season. Subjects commonly experienced decreased activity in winter and autumn (i.e., median activity 4.1% and 2.5% below annual average, respectively) and increased activity in spring and summer (i.e., median activity 1.7% and 2.5% above annual average, respectively). However, not all subjects demonstrated same seasonal patterns. Subject numbers for outliers denoted by circles (those subjects who were more than 1.5 times the interquartile range [IQR] above the 75th quartile or more than 1.5 times the IQR below the 25th quartile). Halsne EG, Waddingham MG, Hafner BJ. Long-term activity in and among persons with transfemoral amputation. J Rehabil Res Dev. 2013;50(4):515–30.http://dx.doi.org/10.1682/JRRD.2012.04.0066