The data analysis was carried out in the Matlab (from Math-
Works, Inc.; Natick, MA, USA) programming environment.
Nine tasks from the BBS were selected for further analysis. The
tasks excluded, among them stool stepping, involve periodic
movements or movements that fewer test subjects were able to
perform. For example, only 39 subjects were able to execute the
standing on one foot task, so its inclusion in the analysis would
have complicated interpretation of the results