Fig 1. Forest plot of model effects.

When adjusted for age, gender, and comorbidities, age, liver cirrhosis/fibrosis and tumor disease had a strong impact on in-hospital mortality. Among virus groups, patients with wild-type to delta variant infection had a higher risk for in-hospital mortality compared to patients with influenza infection. Furthermore, patients with omicron variant infection had a higher risk for in-hospital mortality when compared to patients with influenza infection. COPD indicates chronic obstructive pulmonary disease.