Table 6.

ROC analysis to screening the severity of fibromyalgia symptoms according to the right and left PFC activation based on Δ-HbO* (n = 22).

AUC 95% CI	CI 95%	Cutoffs	Sensitivity	1 − Specificity
Portuguese Profile of Chronic Pain Screen (BP-PCP:S) total score
Δ-HbO* based on the HbO level before thermal stimuli onset and 15 s after on the left PFC (mM)
0.58	(CI 95%, 0.21–0.95)	− 0.175	100	100
Δ-HbO* based on the HbO level before thermal stimuli onset and 15 s after on the right PFC (mM)
0.59	(CI 95%, 0.20–0.97)	− 0.20	100	100
Central Sensitization Inventory (BP-SCI) total score
Δ-HbO* based on the HbO level before thermal stimuli onset and 15 s after on the left PFC (mM)
0.82	(CI 95%, 0.61–100)	− 0.175	100	100
Δ-HbO based on the HbO level before thermal stimuli onset and 15 s after on the right PFC (mM)
0.68	(CI 95%, 0.29–100)	− 0.20	100	100

AUC area under the curve, CI confidence interval, ROC receiver operator characteristics, mM millimolar.