Stratified analysis of risk factors affecting vasovagal reactions in first-time whole blood donors: A regional multi-center donor hemovigilance data study.

Background And Objectives: Vasovagal reactions (VVR) are the most common adverse reactions in blood donation. This study aimed to provide and analyze the data of the regional hemovigilance system in Chongqing, China from 2020 to 2022, report the prevalence and explore the risk factors of VVR.

Materials And Methods: R software (version 4.