Fig. 3.

Incidence of HZ with PHN episodes as a share of total HZ cases based on registered PHN diagnosis and analgesic prescriptions stratified by age, 2019. HZ, herpes zoster; PHN, post-herpetic neuralgia. A disease episode is defined as an episode of healthcare visits starting with an index event with an HZ diagnosis (ICD-10 code starting with B02) and has a washout period of 365 days. A PHN episode is defined as a disease episode where at least one healthcare visit during the disease episode has a diagnosis of PHN (ICD-10 code of B02.2 and/or G53.0). An episode with drug prescription is defined as an episode with prescription of drugs with the ATC codes N01BX04 (capsaicin), N03AX12 (gabapentin), N03AX16 (pregabalin), N06AA09 (amitriptyline) and N06AX21 (duloxetine), excluding episodes where the individual had a prescription for these drugs in 2018 or prior to the index event in 2019