Figure 4.

Examples of inaccurate wear-time classification by an accelerometer algorithm. Vehicle transportation of the RCW or other non-wear activities was erroneously interpreted as wear-time by the best accelerometer wear-time algorithm. The top graph shows accelerometer X, Y, Z data. The subject diary trace shows actual don/doff times. The accelerometer algorithm trace shows premature and incorrect identification of the start and end of wear event 1, and good identification of event 3. From the subject’s diary, events 2 and 4 are known to be transportation of the orthosis but were erroneously labeled as don time by the algorithm.