Gait Test

Velocity (m/s)

Cognitive Cost (%)


Controls (n = 41)

MCI (n = 41)

ttest
pvalue*

Controls (n = 41)

MCI (n = 41)

ttest
pvalue


Usual gait

1.23 (0.19)^{a}

1.13 (0.20)^{a}

0.023
   
DTmotor

1.21 (0.17)^{a}

1.05 (0.17)^{a}

< 0.001

1.2 (10.4)^{a}

5.8 (10.6)^{a}

0.055

DTcounting1

1.19 (0.19)^{a,†}

1.00 (0.24)^{a,‡}

< 0.001

2.6 (10.1)^{a,‡}

11.7 (12.9)^{b,†}

< 0.001

MTmotor&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

DTanimals

1.11 (0.20)^{b,‡}

0.88 (0.28)^{c,‡}

< 0.001

10.0 (12.2)^{b,‡}

22.3 (16.1)^{d,‡}

< 0.001

DTcounting7

1.02 (0.23)^{c,‡}

0.73 (0.26)^{d,‡}

< 0.001

17.6 (11.5)^{c,‡}

34.4 (21.1)^{d,‡}

< 0.001

MTmotor&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; DTmotor, dualtask gait test while carrying glass of water on tray; DTcounting1, dualtask gait test while counting backwards by 1 s; MTmotor&counting1, multitask gait test of carrying glass of water on tray and counting backwards by 1 s; DTanimals, dualtask gait test while naming animals; DTcounting7, dualtask gait test while counting backwards by 7 s; MTmotor&counting7, multitask 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 dualtask testing compared to usual gait and there was a significant change in cognitive cost compared to the cognitive cost under dualtask gait test while carrying glass of water on tray (DTmotor) at the p < .05 level and ‡ at the p < .001 level