Fig. 4. Kaplan–Meier curve. Time from selective nerve root block (SNRB) to complete cure of postherpetic neuralgia (PHN) was significantly shorter in the acute group than in the subacute group (2.4 ± 0.7 years vs. 5.0 ± 0.4 years; P = 0.003 by log-rank test). Acute group: SNRB ≤ 14 days; subacute group: SNRB >14 days from herpes zoster onset.
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