Table 2: The results of repeated-measures ANOVA for each variable.

VariableGroup  conditionConditionGroupPost hoc

AreaCoPF(2, 81) = 0.45F(1, 81) = 0.76F(2, 81) = 6.16HC-CFS, HC-FM
Postural swayF(2, 81) = 0.20F(1, 81) = 4.32F(2, 81) = 5.08HC-CFS
Adjusting ankle torqueF(2, 81) = 2.41F(1, 81) = 15.93F(2, 81) = 5.97HC-FM

Postural swayAmp-APF(2, 81) = 0.84F(1, 81) = 6.92F(2, 81) = 4.36HC-CFS
Amp-MLF(2, 81) = 0.41F(1, 81) = 0.71F(2, 81) = 4.90HC-CFS
F-APF(2, 81) = 1.61F(1, 81) = 13.08F(2, 81) = 22.08HC-CFS, HC-FM
F-MLF(2, 81) = 1.24F(1, 81) = 5.67F(2, 81) = 16.01HC-CFS, HC-FM

Adjusting ankle torqueAmp-APF(2, 81) = 1.07F(1, 81) = 12.38F(2, 81) = 4.89HC-FM
Amp-MLF(2, 81) = 0.70F(1, 81) = 4.79F(2, 81) = 4.99HC-CFS, HC-FM
F-APF(2, 81) = 0.82F(1, 81) = 0.53F(2, 81) = 2.51
F-MLF(2, 81) = 0.77F(1, 81) = 0.01F(2, 81) = 1.55

CoP: center of pressure; Amp: amplitude (mm); F: frequency (Hz); AP: anteroposterior; ML: mediolateral; conditions: baseline and experimental conditions with the concurrent cognitive task; HC: healthy control; CFS: chronic fatigue syndrome; FM: fibromyalgia; ; .