Table 3. Effect sizes and statistical power for main effects over time and between groups.
Variables Phase Analysis F tests F value P value Effect size (ηp2) Statistical power
Medio-lateral CoP range (cm) P1 Time 4.063 .057 .162 .485
Group .150 .861 .014 .070
Time × Group 1.311 .291 .111 .252
P2 Time .076 .785 .004 .058
Group 1.018 .378 .088 .204
Time × Group .665 .525 .060 .147
Antero-posterior CoP range (cm) P1 Time 6.314 .020* .231 .669
Group .753 .483 .067 .161
Time × Group 1.562 .233 .129 .294
P2 Time 7.211 .014* .256 .726
Group 5.888 .009* .359 .822
Time × Group 4.643 .021* .307 .719
Medio-lateral CoP mean velocity (cm/s) P1 Time 5.928 .024* .220 .642
Group .025 .975 .002 .053
Time × Group .738 .490 .066 .158
P2 Time .221 .643 .010 .073
Group .410 .669 .038 .108
Time × Group 2.194 .136 .173 .397
Antero-posterior CoP mean velocity (cm/s) P1 Time 8.994 .007* .300 .816
Group .736 .491 .065 .158
Time × Group 1.766 .195 .144 .328
P2 Time 6.944 .015* .249 .710
Group 1.727 .202 .141 .321
Time × Group 5.402 .013* .340 .787
Vertical ground reaction torque (Nm) P1 Time 17.259 .000* .451 .977
Group 2.169 .139 .171 .393
Time × Group 1.601 .225 .132 .300
P2 Time 14.046 .001* .401 .946
Group .025 .975 .002 .053
Time × Group 2.838 .081 .213 .497
Medio-lateral CoP position within BoS (%) P1 Time .574 .457 .027 .112
Group 1.926 .171 .155 .354
Time × Group 1.870 .179 .151 .345
P2 Time 12.194 .002* .367 .914
Group .533 .594 .048 .126
Time × Group 1.068 .362 .092 .212
Antero-posterior CoP position within BoS (%) P1 Time 4.254 .052 .168 .503
Group 2.757 .086 .208 .484
Time × Group 4.060 .032* .279 .657
P2 Time 9.294 .006* .307 .828
Group 2.520 .104 .194 .449
Time × Group 7.761 .003* .425 .916
* Indicates statistically significant difference p < 0.05.