Link to article: https://jamanetwork.com/journals/jama-health-forum/fullarticle/2836434

Importance Estimating global lives and life-years saved is important to put into perspective the benefits of COVID-19 vaccination. Prior studies have focused mainly on the pre-Omicron period or only on specific regions, and lack crucial life-year calculations and often depend on strong modeling assumptions with unaccounted uncertainty.

Results In the main analysis, more than 2.5 million deaths were averted (1 death averted per 5400 vaccine doses administered). Eighty-two percent were among people vaccinated before any infection, 57% were during the Omicron period, and 90% pertained to people 60 years or older. Sensitivity analyses suggested 1.4 to 4.0 million lives were saved. Some sensitivity analyses showed a preponderance of the benefit during the pre-Omicron period. An estimated 14.8 million life-years were saved (1 life-year saved per 900 vaccine doses administered). The sensitivity range was 7.4 to 23.6 million life-years. Most life-years saved (76%) were among people 60 years or older, but long-term care residents contributed only 2% of the total. Children and adolescents (0.01% of lives saved and 0.1% of life-years saved) and young adults aged 20 through 29 years (0.07% of lives saved and 0.3% of life-years saved) had very small contributions to the total benefit.