Varicella-zoster vaccine (VZV) v placebo to prevent herpes zoster at mean 3.13 years*
| Outcomes | Incidence per 1000 person-years | NNT (95% CI) | Vaccine efficacy (CI) | |
|---|---|---|---|---|
| VZV vaccine | Placebo | |||
| *Abbreviations defined in glossary; NNT and CI calculated from number of confirmed cases of herpes zoster and post-herpetic neuralgia in article. | ||||
| Incidence of herpes zoster | 5.42 | 11.12 | 59 (50 to 72) | 51% (44 to 58) |
| Incidence of post-herpetic neuralgia | 0.46 | 1.38 | 364 (259 to 577) | 67% (48 to 79) |