How accurately do activity trackers measure step count in adults with gait impairment? A systematic review with Bland-Altman meta-analysis.

Background Many patients in physiotherapy practice have gait impairments, and the aim is to maintain or improve their activity level. Physical activity can be quantified by measuring step count. Activity trackers (AT) are suitable for this purpose as they can be worn during daily activities or various sports. In addition, they offer the opportunity to monitor the number of steps independently, which motivates patients and enables an objective evaluation of progress. However, a prerequisite for such applications is that AT measures accurately. One way to investigate accuracy is through Bland-Altman (BA) analysis,…