TABLE 2.

Demographic, gait, and neuropsychological characteristics as a function of age grouping.

	Variable	Younger adults (≤65), n = 60	Older adults (>65), n = 55	P-value
Demographics	Age	51.4 ± 13.36	70.27 ± 3.96	p < 0.001§ *
	Gender (F/M)	34 (56.7%)/26 (43.3%)	30 (54.5%)/25 (45.5%)	p = 0.22†
	IQ	118.83 ± 7.32	118.86 ± 8.99	p = 0.98§
	Years of education	16.12 ± 1.9	16.27 ± 23.34	p = 0.69§
Neuropsychological performance (domain z-scores)	Processing speed	0.16 ± 0.83	-0.34 ± 0.72	p < 0.001§ *
	Vocabulary	0.32 ± 0.72	0.2 ± 0.93	p = 0.44§
	Episodic memory	0.23 ± 0.92	-0.32 ± 0.95	p < 0.002§ *
	Fluid reasoning	0.13 ± 0.69	-0.38 ± 0.69	p < 0.001§ *
Gait	UW velocity (m/s)	0.96 ± 0.19	0.97 ± 0.18	p = 0.97§
	UW stride length (m)	1.19 ± 0.22	1.2 ± 0.24	p = 0.72§
	UW stride regularity (a.u)	0.78 ± 0.1	0.74 ± 0.11	p = 0.021§¶
	UW step symmetry (a.u)	0.79 ± 0.24	0.84 ± 0.22	p = 0.28§
	UW step regularity (a.u)	0.65 ± 0.16	0.61 ± 0.17	p = 0.27§
	DT velocity (m/s)	0.84 ± 0.13	0.84 ± 0.13	p = 0.76§
	DT stride length (m)	1.15 ± 0.13	1.15 ± 0.19	p = 0.95§
	DT stride regularity (a.u)	0.63 ± 0.2	0.59 ± 0.18	p = 0.22§
	DT step symmetry (a.u)	0.55 ± 0.2	0.54 ± 0.18	p = 0.62§
	DT step regularity (a.u)	0.88 ± 0.35	0.95 ± 0.34	p = 0.26§

Unless otherwise specified, all values are expressed as Mean ± SD. IQ, intelligence quotient; UW, usual walking; DT, dual-task; a.u, arbitrary units. ^†Chi-square test. ^§Independent-samples t-test, *p < 0.002 Bonferroni-corrected for multiple comparisons. ^¶Result does not survive correction for multiple comparisons.