Table 8.

Correlations of the scores in psychological questionnaires with psychophysiological measures within the fibromyalgia patient group (Relations between the psychological and psychophysiological measures)

	FIQ	PCS	STAI-A	STAI-B	PSS	Pain	Stress	%EMG	EMG Rest
PCS	0.40**
STAI-A	0.56**	0.34*
STAI-B	0.54**	0.30*	0.75**
PSS	0.70**	0.29*	0.76**	0.80**
Pain	0.49**	0.51**	0.38**	0.30*	0.45**
Stress	0.38*	0.27	0.57**	0.51**	0.55**	0.50**
%EMG	0.14	0.05	0.20	0.26	0.12	0.01	0.15
EMG Rest	-0.17	-0.05	-0.27	-0.30	-0.25	0.03	-0.33	-0.72**

FIQ Fibromyalgia Impact Questionnaire score, PCS Pain Catastrophizing Scale score, STAI-A State-Trait Anxiety Index State score, STAI-B State-Trait Anxiety Index Trait score, PSS Perceived Stress Scale score, Pain mean reported pain intensity across the protocol, Stress mean reported stress intensity across the protocol, %EMG mean normalized sEMG across the protocol. * = significant at p < 0.05 level; ** significant at p < 0.001 level