Table 2. Moderation analysis.

Relationship between light discomfort threshold (dependent variable) and pressure pain threshold (independent variable) in normal and fibromyalgia groups (independent variable). Pressure pain rating was not significantly correlated with light discomfort threshold when group was included in the model, indicating that fibromyalgia status (group) explained more of the variance than pressure pain threshold.

Model	Unstandardized Coefficients		Standardized Coefficients	t	Signif
	B	Std. Error	Beta
Constant	8.679	1.459		5.948	< 0.001
Pressure Threshold	0.556	0.466	0.170	1.195	0.238
Status (FM vs. control)	−4.476	1.107	−0.575	−4.045	< 0.001