Figure 1. .

Flow diagram of inclusion and exclusion criteria for study cohort. ^aIndex date was defined as the date at which an individual was eligible for study inclusion. ^bOf the 116 153 individuals who only had a single valid dose of RZV, 106 462 (91.7%) of them completed 1 dose during the study period, with 9691 (8.3%) of the individuals having an improperly spaced second dose. ^cTwo valid doses of RZV were defined as receiving the second dose between 30 and 210 days after the first dose. Abbreviations: HZ, herpes zoster; ICD, International Classification of Diseases; OLDW, OptumLabs Data Warehouse; RZV, recombinant zoster vaccine.