Table 3. Effect of disease duration, area of skin lesion, and itching on ΔV_DRG.

The results showed that the regression equation was significant (F = 6.508, ***p < 0.001). The disease duration (β = −0.388, p = 0.013) was a significant negative predictor of ΔV_DRG, and the occurrence of pruritus (β = 0.376, p = 0.017) was a significant positive predictor of ΔV_DRG. Area of skin lesion could not predict ΔV_DRG. Together, these variables explain 43.2% of the variation in ΔV_DRG.

Independent variable	B	β	t	p	F	Adjusted R2
Disease duration	−0.381	−0.388	−2.685	0.013	6.508***	0.432
Area of skin lesion	−6.838	−0.163	−1.040	0.308
Appearance of itching	0.361	0.376	2.573	0.017

Note:

B, unstandardized regression coefficient; β, standardized regression coefficient.