Table 2. Gait parameters during straight walking.

	Go		Back		P value
	FOG–P	PD–FOG	FOG–P	PD–FOG	Group	Condition	Interaction
Stride time CV	3.58±1.47	2.46±1.97	4.25±2.91	2.45±0.75	0.07	0.39	0.38
φCV	3.21±0.97	2.44±0.80	3.44±1.16	2.56±0.95	0.06	0.29	0.73
φ_deviation	2.99±0.91	2.95±1.25	3.47±0.95	3.01±1.26	0.62	0.11	0.21
Slope_mean	−1.50±0.09	−1.57±0.10	−1.47±0.08	−1.59±0.10	0.02	0.99	0.54
φ_asymmetry	2.25±1.26	2.29±1.47	3.41±1.17	2.59±1.75	0.30	0.04	0.16
Δφ_error	8.73±2.39	6.58±3.29	22.27±12.56	7.36±2.44	<0.01	<0.01	<0.01

FOG–P: Patients with freezing of gait (FOG) with little to no parkinsonism.

PD–FOG: Patients with Parkinson’s disease without FOG.

Group: The main effects of group (FOG–P and PD–FOG).

Condition: The main effects of walking condition (‘Go’ and ‘Back’).

Interaction: The interaction between group and walking condition.