Table 3.

Multiple regression analysis between the BP_ND of the dRNs and clinical variables.

Model	Region	Predictors	Adjusted R2	B°	β	p-Value
1	dRNs	– TWSTRS severity	0.47	0.10 (0.14)	0.34	0.49
		– TWSTRS pain		0.02 (0.22)	0.10	0.91
		– Interaction effect		0.00 (0.01)	0.38	0.75
2	dRNs	– TWSTRS severity	0.55	0.44 (0.16)	1.56	0.02
		– PSQI		0.70 (0.35)	1.65	0.07
		– Interaction effect		−0.03 (0.02)	−2.21	0.09

Results of the multiple regression analysis to assess the effect of the TWSTRS severity score, the TWSTRS pain score, the PSQI score, and additional interaction effects on the BP_ND in the dRNs in CD patients. Due to multicollinearity between the TWSTRS pain score and PSQI score, we performed the analysis in two separate steps. For all variables, we calculated the B° (unstandardized coefficient with standard error in parenthesis) and β (standardized regression coefficient). BP_ND, binding potential, non-displaceable; dRNs, dorsal raphe nucleus, subject based; TWSTRS, Toronto Western Spasmodic Torticollis Rating Scale; PSQI, Pittsburgh Sleep Quality Index.