Table 2: Mean (SD) values for walking and the cognitive task values in all groups under single-task (ST) and both dual-task conditions.

STDTwalkDTcog

Gait speed (m/s)
HYA1.86 (.21)1.88 (.22)1.80 (.23)
HOA1.56 (.25)1.58 (.25)1.51 (.29)
PD1.33 (.24)1.28 (.22)1.22 (.22)

Stride length (m)
HYA1.68 (0.15)1.68 (.15)1.63 (.15)
HOA1.43 (0.20)1.40 (.21)1.38 (.22)
PD1.31 (0.20)1.27 (.19)1.24 (.20)

Cadence (steps/min)
HYA134 (15)135 (16)132 (16)
HOA131 (12)135 (13)132 (15)
PD122 (15)122 (16)119 (14)

Step width (m)
HYA0.14 (.02)0.14 (.02)0.14 (.02)
HOA0.13 (.02)0.14 (.03)0.13 (.03)
PD0.13 (.03)0.13 (.04)0.13 (.04)

Step width variability (%)
HYA15.1 (5.2)15.7 (6.0)13.3 (4.5)
HOA17.8 (4.9)16.2 (3.8)17.9 (4.4)
PD16.2 (5.0)14.8 (5.0)16.3 (4.5)

Stride time variability (%)
HYA2.3 (.7)2.1 (.7)2.0 (.5)
HOA2.6 (1.2)2.5 (.8)2.3 (1.0)
PD2.7 (1.0)2.7 (1.0)2.8 (1.4)

Inclination angle (degrees)
HYA7.4 (.6)7.4 (.7)7.5 (.7)
HOA7.6 (1.0)7.6 (1.0)7.5 (1.1)
PD7.5 (.9)7.6 (1.0)7.5 (.9)

Response latency (s)
HYA0.65 (.10)0.82 (.12).66 (.10)
HOA0.87 (.15)0.90 (.15)0.89 (.13)
PD0.97 (.17)1.08 (.24)1.03 (.24)

Response accuracy (%)
HYA99.2 (1.1)98.8 (2.3)99.7 (.9)
HOA98.0 (3.9)97.4 (5.5)97.1 (5.7)
PD90.3 (11.2)89.9 (13.5)92.9 (11.1)