Fig. 2

Forrest plot of the impact of influenza virus type on the illness severity and outcomes of patients hospitalized with Flu-p in China, 2013–2019. Before adjusting for confounders, influenza A virus infection was associated with an increased risks of invasive ventilation and admittance to intensive care unit (ICU), but did not correlate with 30-day mortality. After adjusting for confounders, influenza A virus infection was associated with an increased risks of invasive ventilation, ICU admission and 30-day mortality in Flu-p patients