Table 3: Demonstrates a comparison of results derived from SST outcome measures with the previously published literature.

Variable	Previous literature			RIPPS/SST results
Variable	Article	Perturbation method	Result	RIPPS/SST results
Stepping threshold	Millie, et al. [27]	Motorized waist pulls perturbations	Older adults had lower stepping threshold compared to young adults	Older adults had lower step threshold compared to young adults (unpublished)
	Sturnieks, et al. [33]	Motorized waist pulls perturbations	Future falls associated with lower force threshold during rear stepping waist-pull perturbations but not forward stepping waist-pull perturbations (RR=1.68)	Stepping threshold during rear stepping better predictor than forward stepping threshold. Rear direction measures better predictors than forward direction measures
	Crenshaw, et al. [34]	Motorized treadmill	Posterior stepping direction better predicted future falls (OR: 1.5; AUC=0.62)
Multiple stepping threshold or number of steps (%)	Sturnieks, et al. [33]	Motorized waist pulls perturbations	Non faller: Rear 37% Non faller: FWD 21% Faller: Rear 77% Faller: FWD 45%	Non faller: Rear 44 Non faller: FWD - 30% Faller: Rear 65% Faller: FWD 44%
Multiple stepping threshold or number of steps (%)	Schulz, et al. [36]	Motorized waist pulls perturbations	Non faller: Rear - 1.60 Non faller: FWD - 1.14 BI: Rear - 2.11 BI: FWD - 1.63	Non faller: Rear - 1.43 Non faller: FWD - 1.45 Faller: Rear - 2.41 Faller: FWD - 2.17

FWD: Forward