Hite et al. make two recommendations when performing a test of tandem stance:
The first recommendation may better characterize people with lower balance and mobility function, and the latter recommendation recommendation may uncover subtle but potentially meaningftil deficits in individuals with higher functioning."
Hile ES, Brach JS,
Perera S, Wert DM, VanSwearingen JM, Studenski SA. (2012).
Interpreting the Need for Initial Support to Perform Tandem Stance Tests
of Balance. PTJ 92(10): 1316-1328.