Table 3.

Baseline, week 2, and week 4 CPT values at 250 Hz.

CPT 250 Hz (Aδ-fibres)	Mean [SD] CPT values
	Antihistamine group	Pregabalin group	Refractory group	Healthy control group
Baseline	42.8 [29.3]	38.8 [15.9]	38.3 [20.8]	36.7 [13.6]
Week 2	41.7 [19.6]	37.5 [17.9]	31.3 [12.5]	NA
Week 4	NA	40.3 [23.8]	48.7 [20.1]	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 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 group, the CPT values between the baseline and week 2 and between weeks 2 and 4 were compared using the paired t-test.

Unless otherwise indicated, p > 0.05.