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Fig. 2 | BMC Medicine

Fig. 2

From: Reduced risks of influenza-associated hospitalization and complications following vaccination among over 2 million older individuals: a nationwide study using target trial emulation framework

Fig. 2

Vaccine effectiveness for influenza hospitalization across subgroup and joint subgroup analyses. Abbreviations: CI, confidence interval. *Vaccine effectiveness (VE) = (1 − HR)*100%. Bold VE values and 95% CIs indicate a statistically significant vaccine protection effect. Details of event rates and hazard ratios of vaccinated versus unvaccinated subjects for influenza hospitalization are available in Additional file 1: Table 7. †According to Taiwan’s Center for Disease Control, individuals with one of the following disease histories determined within one year before the index date were defined as subjects at high risk of influenza infection: infectious diseases, blood disorders, endocrinologic disorders, neurological disorders, cardiovascular diseases, respiratory diseases, digestive system diseases, musculoskeletal system, and connective tissue diseases, urogenital system disease, congenital malformations, and chromosomal abnormalities

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BMC Medicine

ISSN: 1741-7015

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