Table S3.

Multiple regression for the linear global time effect (from pretest to 6-month test, N=71) and the interaction between orthogonal contrasts and time effect for gait variable “step length variability”

Dependent variable	Predictor	b	95% CI		SE b	β	P two tailed	R2-change
Step length variability preferred	Linear global time effect	−0.39	−0.50	−0.27	0.06	−0.35	<0.001***	0.118
	Quadratic global time effect	0.08	0.01	0.15	0.03	0.12	0.020*	0.015
	Linear interaction AB × C	−0.03	−0.11	0.06	0.04	−0.03	0.548	0.001
	Linear interaction A × B	0.01	−0.13	0.16	0.07	0.01	0.866	0.000
Step length variability fast	Linear global time effect	−0.15	−0.31	0.01	0.08	−0.11	0.059t	0.013
	Quadratic global time effect	0.13	0.04	0.22	0.05	0.17	0.005**	0.029
	Linear interaction AB × C	−0.05	−0.16	0.06	0.06	−0.05	0.377	0.003
	Linear interaction A × B	0.01	−0.18	0.21	0.10	0.01	0.911	0.000
Step length variability preferred DT	Linear global time effect	−0.32	−0.50	−0.13	0.09	−0.18	0.001**	0.030
	Quadratic global time effect	0.03	−0.07	0.14	0.05	0.03	0.549	0.001
	Linear interaction AB × C	−0.02	−0.14	0.11	0.07	−0.01	0.817	0.000
	Linear interaction A × B	0.22	−0.01	0.45	0.12	0.10	0.062t	0.009
Step length variability fast DT	Linear global time effect	−0.10	−0.30	0.09	0.10	−0.06	0.286	0.004
	Quadratic global time effect	0.07	−0.04	0.19	0.06	0.07	0.192	0.005
	Linear interaction AB × C	0.05	−0.09	0.18	0.07	0.04	0.490	0.002
	Linear interaction A × B	0.14	−0.10	0.38	0.12	0.06	0.262	0.004
Step length variability preferred DTC	Linear global time effect	0.07	−0.04	0.17	0.05	0.08	0.229	0.006
	Quadratic global time effect	−0.01	−0.07	0.05	0.03	−0.02	0.811	0.000
	Linear interaction AB × C	−0.02	−0.09	0.06	0.04	−0.03	0.693	0.001
	Linear interaction A × B	0.10	−0.04	0.23	0.07	0.09	0.150	0.008
Step length variability fast DTC	Linear global time effect	0.00	−0.11	0.12	0.06	0.00	0.962	0.000
	Quadratic global time effect	−0.05	−0.11	0.02	0.03	−0.10	0.141	0.010
	Linear interaction AB × C	0.04	−0.04	0.11	0.04	0.06	0.375	0.004
	Linear interaction A × B	0.05	−0.09	0.19	0.07	0.05	0.468	0.002

Notes: Bold values indicate significance or trend.

^*P<0.05.

^**P<0.01.

^***P<0.001.

^tP<0.10 trend.

Abbreviations: A, DANCE; B, MEMORY; C, PHYS; CI, confidence interval; DANCE, virtual reality video game dancing; DT, dual-task; DTC, dual-task cost; MEMORY, treadmill walking with simultaneous verbal memory training; PHYS, treadmill walking; SE, ± standard error.