Table 1.

The general conditions of the patients (mean ± SD).

Parameters	Group C	Group H
Patients (n)	26	26
Gender (M/F)	10/16	12/14
Age (year, range)	64.15 ± 12.29	66.62 ± 8.21
Wight (kg)	65.17 ± 10.88	66.00 ± 14.42
Pain duration (day)	56.69 ± 13.70	58.85 ± 16.62
Pain side (n,%)
Left	10	8
Right	16	18
Preoperative drug dosage
Pregabalin(mg/day)	317.31 ± 88.25	334.62 ± 88.25
Ptosis	3	3

Group C, conventional pulsed radiofrequency; Group H, high voltage pulsed radiofrequency.