TABLE 5.

Comparison of stability margin between the FAI group and the control group during walking over obstacles of different heights (mean ± SD).

Variables	Height	Group		P-value
		FAI	Control	Group	Height	Group × height
Preparation phase
ML_MoS (m)	0%	−0.375 ± 0.016	−0.386 ± 0.019	0.075	<0.001*abc	0.636
	10%	−0.360 ± 0.018	−0.375 ± 0.019
	20%	−0.351 ± 0.019	−0.365 ± 0.017
AP_MoS (m)	0%	−0.053 ± 0.043	−0.070 ± 0.037	0.688	<0.001*ab	0.255
	10%	0.010 ± 0.043	0.014 ± 0.024
	20%	0.024 ± 0.033	0.021 ± 0.022
Execution phase - toe clearance over obstacle
ML_MoS (m)	0%	−0.406 ± 0.029	−0.417 ± 0.024	0.136	<0.001*abc	0.616
	10%	−0.385 ± 0.026	−0.403 ± 0.028
	20%	−0.373 ± 0.028	−0.389 ± 0.022
AP_MoS (m)	0%	−0.240 ± 0.061	−0.273 ± 0.053	0.470	<0.001*abc	0.241
	10%	−0.133 ± 0.071	−0.139 ± 0.051
	20%	−0.106 ± 0.060	−0.118 ± 0.053
Execution phase - heel clearance over obstacle
ML_MoS (m)	0%	−0.422 ± 0.034	−0.432 ± 0.028	0.164	<0.001*abc	0.481
	10%	−0.394 ± 0.028	−0.415 ± 0.033
	20%	−0.379 ± 0.030	−0.397 ± 0.024
AP_MoS (m)	0%	−0.298 ± 0.067	−0.330 ± 0.052	0.498	<0.001*abc	0.374
	10%	−0.176 ± 0.076	−0.183 ± 0.058
	20%	−0.146 ± 0.064	−0.158 ± 0.059
Completion phase
ML_MoS (m)	0%	0.045 ± 0.016	0.049 ± 0.019	0.046*	<0.001*ab	0.002*
	10%	0.048 ± 0.019	0.068 ± 0.029
	20%	0.046 ± 0.016	0.073 ± 0.025
AP_MoS (m)	0%	0.047 ± 0.047	0.024 ± 0.043	0.545	<0.001*ab	0.001*
	10%	0.105 ± 0.053	0.135 ± 0.041
	20%	0.119 ± 0.048	0.146 ± 0.045

Note: *: P < 0.05; ^a: Significant difference when obstacle height increased from 0% to 10%; ^b: Significant difference when obstacle height increased from 0% to 20%; ^c: Significant difference when obstacle height increased from 10% to 20%.

Abbreviations: FAI, Functional Ankle Instability; MoS, margin of stability; ML, Medio-lateral; AP, Anterior-posterior.