Table 3.

Mann–Whitney U statistics between children and adults for proprioception, time on the slackline at pre-test (t_pre) and at post-test (t_post), postural stability (PS), gaze movement (GM), head-in-space rotation (HR), head-in-space translation (Ht), trunk-in-space rotation (TR), head-on-trunk rotation (HTR), and for cross-correlation between head-in-space and trunk-in-space rotations (CC HR-TR).

Measure	N	U	Z	p	r
Proprioception	31	42	−2.686	0.007	0.48
tpre	31	74	−1.310	0.201	0.24
tpost	31	0	−4.453	<0.001	0.80
PS	21	0	−3.766	<0.001	0.82
GM	28	40	−2.397	0.016	0.45
HR	30	22	−3.432	<0.001	0.63
Ht	30	16	−3.696	<0.001	0.67
TR	27	49	−1.434	0.163	0.28
HTR	27	70	−0.566	0.596	0.11
CC HTR-TR	21	32	−1.268	0.224	0.28

Effect size r was calculated according to $r=\frac{Z}{\sqrt{N}}$, with N the total number of samples.