Table 2.

Intragroup single- vs dual-task comparisons for women with fibromyalgia and healthy controls.

Variable	Intragroup p value	Effect size (r)
Women with fibromyalgia
Overall sway index	0.004	0.67
Anterior/posterior sway index	0.012	0.59
Medial/lateral sway index	0.286	0.25
Healthy controls
Overall sway index	0.349	0.23
Anterior/posterior sway index	0.438	0.19
Medial/lateral sway index	0.155	0.36

p values refer to the Wilcoxon signed-rank test.