Table 2.

Spatiotemporal characteristics and center of mass (COM) position variables during the deceleration phase of the STOP task, mean (standard deviation).

	Adults	Children	p
Time (s)	0.72 (0.11)	0.78 (0.15)	.04
Number of steps	5.13 (0.91)	4.59 (0.72)	<.001
Distance (m)	2.89 (0.54)	2.58 (0.51)	.04
Normalized distancea	3.10 (0.57)	3.80 (0.82)	<.001
Step length (m)	0.71 (0.12)	0.74 (0.15)	.26
Normalized step lengtha	0.77 (0.14)	1.08 (0.20)	<.001
Stance time (s)	0.16 (0.03)	0.17 (0.04)	.60
COM A–P excursionb	0.48 (0.09)	0.65 (0.14)	.001
COM vertical excursionb	0.27 (1.9)	0.13 (1.7)	.83
Average COM posterior positionb	0.30 (0.04)	0.14 (0.08)	<.001
Average COM vertical positionb	0.86 (0.03)	0.94 (0.07)	<.001
% time COM is anterior to feetc	8.99 (3.73)	33.39 (6.00)	<.001
% time COM is above standing heightc	n/a	13.00 (14.0)	<.001

n/a = Not applicable (adults maintained a COM position that was lower than their COM standing height throughout deceleration).

^aNormalized to lower limb length.

^bNormalized to center of mass during static standing (COMz).

^cNormalized to time of deceleration phase.