Table 6.

Correlations between force-time curve characteristics and questionnaires studied through the Spearman’s rho correlation coefficients (rho).

	FIQR	FAS	HGs peak force levels	Time to reach maximum plateau of the curves	HGs-AUC
WPI	0.732 < 0.0001	0.823 < 0.0001	−0.612 < 0.0001	−0.195 0.0415	−0.615 < 0.0001
FIQR		0.761 < 0.0001	−0.576 < 0.0001	−0.054 0.5768	−0.592 < 0.0001
FAS			−0.577 < 0.0001	−0.167 0.0813	−0.588 < 0.0001
HGs peak force levels				−0.151 0.0249	0.991 < 0.0001
Time to reach maximum plateau of the curves					−0.135 0.0456

Abbreviations: HGs = handgrip strength, FIQR = revised Fibromyalgia Impact Questionnaire, FAS = Fibromyalgia Assessment Status, AUC = area under the curve, WPI = Widespread Pain Index.