Table 2.

Differences in gait velocity and cognitive cost between controls and those with Mild Cognitive Impairment

Gait Test	Velocity (m/s)			Cognitive Cost (%)
	Controls (n = 41)	MCI (n = 41)	t-test p-value*	Controls (n = 41)	MCI (n = 41)	t-test p-value
Usual gait	1.23 (0.19)a	1.13 (0.20)a	0.023
DT-motor	1.21 (0.17)a	1.05 (0.17)a	< 0.001	1.2 (10.4)a	5.8 (10.6)a	0.055
DT-counting1	1.19 (0.19)a,†	1.00 (0.24)a,‡	< 0.001	2.6 (10.1)a,‡	11.7 (12.9)b,†	< 0.001
MT-motor&counting1	1.15 (0.17)b,‡	0.95 (0.21)b,‡	< 0.001	5.9 (13.9)a,‡	15.7 (12.9)c,‡	0.0012
DT-animals	1.11 (0.20)b,‡	0.88 (0.28)c,‡	< 0.001	10.0 (12.2)b,‡	22.3 (16.1)d,‡	< 0.001
DT-counting7	1.02 (0.23)c,‡	0.73 (0.26)d,‡	< 0.001	17.6 (11.5)c,‡	34.4 (21.1)d,‡	< 0.001
MT-motor&counting7	0.99 (0.22)c, ‡	0.75 (0.24)d,‡	< 0.001	19.9 (12.9)c,‡	32.9 (17.9)d,‡	< 0.001
2 way ANOVA*	Group p < 0.001 Task p < 0.001 Group x Task p = 0.005			Group p < 0.001 Task p < 0.001 Group x Task p < 0.001

*, Bonferroni correction for multiple comparisons; DT-motor, dual-task gait test while carrying glass of water on tray; DT-counting1, dual-task gait test while counting backwards by 1 s; MT-motor&counting1, multi-task gait test of carrying glass of water on tray and counting backwards by 1 s; DT-animals, dual-task gait test while naming animals; DT-counting7, dual-task gait test while counting backwards by 7 s; MT-motor&counting7, multi-task gait test of carrying glass of water and counting backwards by 7 s. Superscript letters (a,b,c,d) denote results of the Bonferroni pairwise within group comparisons across tasks. Conditions within the groups that have the same superscript do not differ from one another. Superscript † indicates that there is a significant change in velocity under dual-task testing compared to usual gait and there was a significant change in cognitive cost compared to the cognitive cost under dual-task gait test while carrying glass of water on tray (DT-motor) at the p < .05 level and ‡ at the p < .001 level