Table 2.

Significant results from the four (Group) x four (Phase) x two (Visual condition) ANOVAs in the principal postural movement components (PP).

	ANOVA
Variables	Main Effect or Interaction	F	df	p	η2p	Power	Post-hocs
PP-rSDT1	Group	4.582	3, 73	0.005	0.158	0.87	C-NG < A-NG
	Phase	29.931	3, 73	<0.001	0.291	1.00	BV < DV, AV2 < AV1
	Visual condition	41.841	1, 75	<0.001	0.364	1.00	EO < EC
${\text{PP-rSDT}}_2^{\text{a}}$	Group	3.965	3, 73	0.011	0.140	0.81	–
	Phase	30.766	3, 73	<0.001	0.296	1.00	BV, AV2 > DV > AV1
	Visual condition	35.136	1, 75	<0.001	0.325	1.00	EO > EC
${\text{PP-rSDT}}_3^{\text{b}}$	Phase	8.136	3, 73	<0.001	0.100	0.99	BV > AV1, AV2; DV > AV2
	Visual condition	26.661	1, 75	<0.001	0.268	0.99	EO > EC
${\text{PP-rSDT}}_4^{\text{b}}$	Group	4.487	3, 73	0.006	0.156	0.86	C-NG > A-NG, A-G
	Phase	26.649	3, 73	<0.001	0.267	1.00	BV, AV2 > DV > AV1
	Visual condition	19.467	1, 75	<0.001	0.211	0.99	EO > EC
${\text{PP-rSDT}}_5^{\text{b}}$	Group	3.647	3, 73	0.016	0.130	0.78	C-NG > A-NG
	Phase	72.412	3, 73	<0.001	0.498	1.00	BV > AV2 > DV, AV1
	Visual condition	22.094	1, 75	<0.001	0.232	1.00	EO > EC
${\text{PP-rSDT}}_6^{\text{b}}$	Phase	4.980	3, 73	0.002	0.064	0.87	BV, DV < AV1
	Visual condition	7.395	1, 75	0.008	0.092	0.77	EO > EC

C-NG, children non-gymnast; C-G, children gymnast; A-NG, adult non-gymnast; A-G, adult gymnast; EO, eyes open; EC, eyes closed; BV, before vibration phase; DV, during vibration phase; AV1, early after vibration phase; AV2, later after vibration phase; PP-rSDT, principal position relative standard deviation.

^aTest of normality failed. Square root values were used to compute ANOVA.

^bTest of normality failed. Values were transformed on ranks to compute ANOVA.