Table 3.

Straight task outcomes for the three subject groups, including patients in the PD-FOG group in all conditions of stimulation, mean (SD)

	Step length (cm)	Step length CoV (cm)	Cadence (steps/min)
Healthy controls	65.5 (6.8)	0.02 (0.01)	114.2 (10.6)
Parkinson’s disease Controls	59.8 (6.3)	0.03 (0.01)	117.0 (6.9)
PD FOG Off DBS	34.9 (9.6)a	0.09 (0.04)a	116.9 (12.4)
PD FOG Unilateral DBS	36.1 (8.6)a	0.09 (0.06)a	123.6 (9.9)
PD FOG Bilateral DBS	38.7 (7.0)a	0.09 (0.05)a	121.5 (13.0)

a PD FOG different to Parkinson’s disease controls and healthy controls, P < 0.01.

CoV = coefficient of variation; DBS = deep brain stimulation.