Table 3.

Prediction sensitivity, specificity, and likelihood ratios of slip outcomes (fall vs. recovery) from logistic regression analysis based on each predictive variable.

Predictive variables		Sensitivity		Specificity		Overall prediction (%)	Likelihood ratio		p value	Threshold
		Value (% fall)	95% CI	Value (% recovery)	95% CI		Value	95% CI
Feasible-stability-region measurement		68.4	58.6–76.7	56.2	45.8–66.0	62.6	1.56	1.19–2.05	< 0.001	−0.160
Margin of stability		71.4	61.8–79.4	36.0	26.8–46.3	54.5	1.12	0.91–1.36	0.166
Floquet multiplier		71.4	61.8–79.4	43.8	34.0–54.2	58.3	1.27	1.02–1.59	0.121
Lyapunov exponent	Short-term	84.7	76.3–90.5	15.7	9.61–24.7	51.9	1.01	0.89–1.14	0.383
	Long-term	65.3	55.5–74.0	48.3	38.2–58.6	57.2	1.26	0.99–1.62	0.205
Gait parameters variability	Step length	63.3	53.4–72.1	47.2	37.2–57.5	55.6	1.20	0.94–1.54	0.116
	Step width	60.2	50.3–69.3	48.3	38.2–58.6	54.5	1.17	0.90–1.51	0.011	0.026
	Step time	84.7	76.3–90.5	18.0	11.4–27.2	52.9	1.03	0.91–1.17	0.459

CI: confidence interval.