Mean NPSI scores in patients with herpes zoster (HZ)-related pain during the 12-month follow-up period by age-group. NPSI = Neuropathic Pain Symptom Inventory. NPSI score >30 indicates moderate pain (range score 0–100). Mean NPSI scores were calculated in the population of patients aged 70 years or more with HZ-related pain (day 0) or PHN (months 3, 6, and 12) and available NPSI data at each time-point. Missing data were not replaced.