Table 2.

Regression analyses summary (Association between duration of stimulation and pain intensity).

	Stimulation group			Sham group
	Unstandardized		Standardized	Unstandardized		Standardized
	B	SE	Beta	B	SE
Constant	3.377***	0.084		4.734***	0.170
Day	−0.036***	0.005	−0.817***	−0.026**	0.010	−0.449**
R 2	0.667			0.201
Adj. R2	0.654			0.171**
F (df 1; 26)	52.110***			6.552

**p < 0.05; ***p < 0.001.