Fig. 3. Patient-reported long-term severity of postherpetic neuralgia (PHN). Acute group: selective nerve root block (SNRB) ≤ 14 days, subacute group; SNRB >14 days from herpes zoster onset. Details of patients-reported 4-step severity grading of PHN: “relieved”, no pain; “improved”, pain is reduced but remained; “sustained”, painful and no change in pain after treatment; “aggravated”, more painful after treatment. aThe proportions of cured (relieved) patients were 62.5% and 25.5% in acute and subacute groups, respectively, which was significantly different by Mann–Whitney rank-sum test (P = 0.007).
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