Table 2.

Baseline, week 2, and week 4 CPT values at 5 Hz.

CPT 5 Hz (C-fibres)	Mean [SD] CPT values
	Antihistamine group	Pregabalin group	Refractory group	Healthy control group
Baseline	28.0 [23.9]	26.4 [12.6]	23.6 [15.5]	22.1 [10.6]
Week 2	17.4 [12.1]	28.4 [16.7]	18.3 [6.5]	NA
Week 4	NA	16.3 [9.3]*	22.7 [6.4]	NA

CPT, current perception threshold. NA, Not applicable.

At baseline, the CPT values were compared among the Antihistamine, Pregabalin, Refractory, and Healthy control groups using the analysis of variance (ANOVA). In the Antihistamine group, the CPT values at the baseline and week 2 were compared using the paired t-test. In the Pregabalin and Refractory groups, the CPT values between the baseline and week 2 and between weeks 2 and 4 were compared using the paired t-test.

*p < 0.05.

Unless otherwise indicated, p > 0.05.