Table 5.

Factors associated with relapse after radiofrequency thermocoagulation for patients with postherpetic neuralgia

Factors	Unadjusted analysis		Adjusted analysis
	HR (95% CI)	p values	HR (95% CI)	p values
Gender
Female	0.724 (0.465–1.126)	0.151	0.741 (0.466–1.176)	0.203
Male
Age, years
< 65	1.321 (0.753–2.318)	0.332	1.278 (0.712–2.294)	0.411
≥ 65
BMI, kg/m2
< 18.5	Ref		Ref
18.5–23.9	1.717 (0.517–5.702)	0.378	1.860 (0.526–6.582)	0.336
≥ 24	1.344 (0.378–0.226)	0.226	1.046 (0.628–1.741)	0.863
Lesion segment
Chest and back	0.826 (0.497–1.372)	0.461	1.131 (0.658–1.946)	0.655
Waist and abdomen
Lesion side
Left	1.137 (0.727–1.778)	0.574	1.139 (0.717–1.810)	0.580
Right
Course of disease, months
1–3	2.389 (1.484–3.845)	< 0.001	2.086 (1.277–3.409)	0.003
> 3
Type of RF electrode
Monopole	0.200 (0.063–0.633)	0.006	0.258 (0.080–0.831)	0.023
Bipolar
Complications
No	2.010 (1.198–3.372)	0.008	1.740 (1.015–2.983)	0.044
Yes
Treatment history
Medication	0.710 (0.365–1.382)	0.313	0.836 (0.422–1.658)	0.609
Neuromodulation
Pain grade
Moderate	3.188 (2.013–5.050)	< 0.001	2.724 (1.654–4.485)	< 0.001
Severe

BMI Body mass index