Development of a nomogram for severe influenza in previously healthy children: a retrospective cohort study.

Objective: We aimed to develop a nomogram to predict the risk of severe influenza in previously healthy children.

Methods: In this retrospective cohort study, we reviewed the clinical data of 1135 previously healthy children infected with influenza who were hospitalized in the Children's Hospital of Soochow University between 1 January 2017 and 30 June 2021. Children were randomly assigned in a 7:3 ratio to a training or validation cohort.