Table 2.

Effects of APA Errors and Age Group

	APA Errors			Age Group			Interaction
	df	F	p	df	F	p	df	F	p
Step latency	1, 934	125.3	<.0001**	1, 24	<0.1	.87	1, 934	0.1	.90
APA onset	1, 934	0.2	.75	1, 24	0.2	.66	1, 934	2.3	.13
APA–step correlation	1, 22	16.4	<.001**	1, 24	0.6	.45	1, 22	7.3	.01 *
Step length	1, 861	0.3	.60	1, 24	5.1	.03*	1, 861	<0.1	.95
ΔCOM/height	1, 926	73.0	<.0001**	1, 24	9.0	.006*	1, 926	<0.1	.85
ΔCOM/step length	1, 861	85.8	<.0001**	1, 24	<0.1	0.9	1, 858	1.6	.21

Notes: Degrees of freedom, F statistic, and p value for step latency, APA onset, APA-step correlation, step length, and center of mass displacement, respectively, as a function of APA error (present or absent) and age group (young vs older). A linear mixed model was applied, with APA error and age group as fixed factors and participant as random factor. Thirteen participants in each group were included, with 12 participants in each group contributing trials with APA errors. APA = anticipatory postural adjustment; COM = center of mass.

*Indicates statistical significance (p < .05).

**Indicates p < .005.